diff --git a/package.json b/package.json
deleted file mode 100644
index c116cae..0000000
--- a/package.json
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  "private": true,
-  "scripts": {
-    "clean": "rimraf output && rimraf .pulp-cache",
-    "build": "eslint src && pulp build -- --censor-lib --strict",
-    "test": "pulp test && npm run test:run:without_codePointAt",
-    "test:run:without_codePointAt": "node -e \"delete String.prototype.codePointAt; require('./output/Test.Main/index.js').main();\"",
-    "bench:build": "purs compile 'bench/**/*.purs' 'src/**/*.purs' 'bower_components/*/src/**/*.purs'",
-    "bench:run": "node --expose-gc -e 'require(\"./output/Bench.Main/index.js\").main()'",
-    "bench": "npm run bench:build && npm run bench:run"
-  },
-  "devDependencies": {
-    "eslint": "^7.15.0",
-    "pulp": "^15.0.0",
-    "purescript-psa": "^0.8.0",
-    "rimraf": "^3.0.2"
-  }
-}
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..8702b13
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,46 @@
+let 
+  purescript-overlay =
+    builtins.fetchGit {
+      name = "purescript-overlay";
+      url = "https://github.com/thomashoneyman/purescript-overlay.git";
+      rev = "526c92c34a1a0213dc5c4761756375e13d85f8d4";
+    };
+  purerlReleases =
+    builtins.fetchGit {
+      url = "https://github.com/purerl/nixpkgs-purerl.git";
+      ref = "master";
+      rev = "69ea3146f3c4f715c5dbc6e0f8ba7d0ee57bb3bd";
+    };
+  erlangReleases =
+    builtins.fetchGit {
+      name = "nixpkgs-nixerl";
+      url = "https://github.com/id3as/nixpkgs-nixerl.git";
+      rev = "2822128d0fe5c8aac42f0b80045e80e6ac22bfcc";
+    };
+
+  pkgs = import <nixpkgs> {
+      overlays = [
+        (import purescript-overlay).overlays.default
+        (import purerlReleases)
+        (import erlangReleases)
+
+      ];
+    };
+  erlang = pkgs.nixerl.erlang-26-1;
+
+in
+
+pkgs.mkShell {
+    # nativeBuildInputs is usually what you want -- tools you need to run
+    nativeBuildInputs = with pkgs.buildPackages; 
+      [ 
+        nodejs 
+        spago-unstable
+        purs-bin.purs-0_15_14
+        purs-tidy
+        purerl.purerl-0-0-22
+        erlang.erlang
+    ];
+    
+}
+
diff --git a/spago.dhall b/spago.dhall
deleted file mode 100644
index 3eec113..0000000
--- a/spago.dhall
+++ /dev/null
@@ -1,26 +0,0 @@
-{-
-Welcome to a Spago project!
-You can edit this file as you like.
--}
-{ name = "strings"
-, dependencies = [ "arrays"
-          , "control"
-          , "either"
-          , "enums"
-          , "foldable-traversable"
-          , "gen"
-          , "integers"
-          , "maybe"
-          , "newtype"
-          , "nonempty"
-          , "partial"
-          , "prelude"
-          , "tailrec"
-          , "tuples"
-          , "unfoldable"
-          , "unsafe-coerce"
-          ]
-, packages = ./packages.dhall
-, sources = [ "src/**/*.purs" ]
-, backend = "purerl"
-}
diff --git a/spago.lock b/spago.lock
new file mode 100644
index 0000000..1531722
--- /dev/null
+++ b/spago.lock
@@ -0,0 +1,1560 @@
+workspace:
+  packages:
+    strings:
+      path: ./
+      dependencies:
+        - arrays
+        - control
+        - either
+        - enums
+        - foldable-traversable
+        - gen
+        - integers
+        - maybe
+        - newtype
+        - nonempty
+        - partial
+        - prelude
+        - tailrec
+        - tuples
+        - unfoldable
+        - unsafe-coerce
+      test_dependencies:
+        - assert
+        - debug
+      build_plan:
+        - arrays
+        - assert
+        - bifunctors
+        - console
+        - const
+        - contravariant
+        - control
+        - debug
+        - distributive
+        - effect
+        - either
+        - enums
+        - exists
+        - foldable-traversable
+        - functions
+        - functors
+        - gen
+        - identity
+        - integers
+        - invariant
+        - math
+        - maybe
+        - newtype
+        - nonempty
+        - numbers
+        - orders
+        - partial
+        - prelude
+        - profunctor
+        - refs
+        - safe-coerce
+        - tailrec
+        - tuples
+        - type-equality
+        - unfoldable
+        - unsafe-coerce
+  package_set:
+    address:
+      hash: sha256-kLmZv2u5dWVUUaQEwK0b3T1Ghce5a/hG0zlizaYfcXs=
+      url: https://raw.githubusercontent.com/purerl/package-sets/erl-0.15.3-20220629/packages.json
+    compiler: ">=0.15.0 <0.16.0"
+    content:
+      arrays:
+        repo: https://github.com/purerl/purescript-arrays.git
+        version: v6.0.0-erl1
+        dependencies:
+          - bifunctors
+          - control
+          - foldable-traversable
+          - maybe
+          - nonempty
+          - partial
+          - prelude
+          - tailrec
+          - tuples
+          - unfoldable
+          - unsafe-coerce
+      assert:
+        repo: https://github.com/purerl/purescript-assert.git
+        version: v5.0.0-erl1
+        dependencies:
+          - console
+          - effect
+          - prelude
+      bifunctors:
+        repo: https://github.com/purescript/purescript-bifunctors.git
+        version: v5.0.0
+        dependencies:
+          - const
+          - either
+          - newtype
+          - prelude
+          - tuples
+      catenable-lists:
+        repo: https://github.com/purescript/purescript-catenable-lists.git
+        version: v6.0.1
+        dependencies:
+          - control
+          - foldable-traversable
+          - lists
+          - maybe
+          - prelude
+          - tuples
+          - unfoldable
+      console:
+        repo: https://github.com/purerl/purescript-console.git
+        version: v5.0.0-erl1
+        dependencies:
+          - effect
+          - prelude
+      const:
+        repo: https://github.com/purescript/purescript-const.git
+        version: v5.0.0
+        dependencies:
+          - invariant
+          - newtype
+          - prelude
+      contravariant:
+        repo: https://github.com/purescript/purescript-contravariant.git
+        version: v5.0.0
+        dependencies:
+          - const
+          - either
+          - newtype
+          - prelude
+          - tuples
+      control:
+        repo: https://github.com/purerl/purescript-control.git
+        version: v5.0.0-erl1
+        dependencies:
+          - newtype
+          - prelude
+      convertable-options:
+        repo: https://github.com/natefaubion/purescript-convertable-options
+        version: v1.0.0
+        dependencies:
+          - effect
+          - maybe
+          - record
+      datetime:
+        repo: https://github.com/purerl/purescript-datetime.git
+        version: v5.0.2-erl1
+        dependencies:
+          - bifunctors
+          - control
+          - either
+          - enums
+          - foldable-traversable
+          - functions
+          - gen
+          - integers
+          - lists
+          - math
+          - maybe
+          - newtype
+          - ordered-collections
+          - partial
+          - prelude
+          - tuples
+      datetime-parsing:
+        repo: https://github.com/flounders/purescript-datetime-parsing
+        version: 10c0a9aecc60a2a5e8cff35bebe45be4dacaa7f8
+        dependencies:
+          - arrays
+          - datetime
+          - either
+          - enums
+          - foldable-traversable
+          - integers
+          - lists
+          - maybe
+          - numbers
+          - parsing
+          - prelude
+          - psci-support
+          - strings
+      debug:
+        repo: https://github.com/purerl/purescript-debug.git
+        version: v5.0.0-erl1
+        dependencies:
+          - prelude
+      distributive:
+        repo: https://github.com/purescript/purescript-distributive.git
+        version: v5.0.0
+        dependencies:
+          - identity
+          - newtype
+          - prelude
+          - tuples
+          - type-equality
+      effect:
+        repo: https://github.com/purerl/purescript-effect.git
+        version: v3.0.0-erl1
+        dependencies:
+          - prelude
+      either:
+        repo: https://github.com/purescript/purescript-either.git
+        version: v5.0.0
+        dependencies:
+          - control
+          - invariant
+          - maybe
+          - prelude
+      enums:
+        repo: https://github.com/purerl/purescript-enums.git
+        version: v5.0.0-erl1
+        dependencies:
+          - control
+          - either
+          - gen
+          - maybe
+          - newtype
+          - nonempty
+          - partial
+          - prelude
+          - tuples
+          - unfoldable
+      erl-atom:
+        repo: https://github.com/purerl/purescript-erl-atom.git
+        version: v1.2.0
+        dependencies:
+          - prelude
+          - unsafe-coerce
+      erl-binary:
+        repo: https://github.com/purerl/purescript-erl-binary.git
+        version: v0.6.0
+        dependencies:
+          - prelude
+          - maybe
+          - erl-lists
+      erl-cowboy:
+        repo: https://github.com/purerl/purescript-erl-cowboy
+        version: v0.11.0
+        dependencies:
+          - effect
+          - either
+          - erl-atom
+          - erl-binary
+          - erl-kernel
+          - erl-lists
+          - erl-maps
+          - erl-modules
+          - erl-ranch
+          - erl-ssl
+          - erl-tuples
+          - foreign
+          - functions
+          - maybe
+          - prelude
+          - record
+          - transformers
+          - tuples
+          - unsafe-coerce
+      erl-file:
+        repo: https://github.com/purerl/purescript-erl-file.git
+        version: v0.0.3
+        dependencies:
+          - erl-atom
+          - erl-binary
+          - prelude
+      erl-gun:
+        repo: https://github.com/id3as/purescript-erl-gun.git
+        version: v0.0.2
+        dependencies:
+          - convertable-options
+          - datetime
+          - effect
+          - either
+          - erl-atom
+          - erl-binary
+          - erl-kernel
+          - erl-lists
+          - erl-maps
+          - erl-process
+          - erl-ssl
+          - erl-tuples
+          - erl-untagged-union
+          - foreign
+          - functions
+          - maybe
+          - prelude
+          - record
+          - simple-json
+          - typelevel-prelude
+      erl-jsone:
+        repo: https://github.com/purerl/purescript-erl-jsone
+        version: v0.4.0
+        dependencies:
+          - arrays
+          - integers
+          - assert
+          - either
+          - erl-lists
+          - erl-tuples
+      erl-kernel:
+        repo: https://github.com/id3as/purescript-erl-kernel.git
+        version: v0.0.3
+        dependencies:
+          - convertable-options
+          - datetime
+          - effect
+          - either
+          - erl-atom
+          - erl-binary
+          - erl-lists
+          - erl-maps
+          - erl-process
+          - erl-tuples
+          - erl-untagged-union
+          - foldable-traversable
+          - foreign
+          - functions
+          - integers
+          - maybe
+          - newtype
+          - partial
+          - prelude
+          - record
+          - typelevel-prelude
+          - unsafe-coerce
+      erl-lager:
+        repo: https://github.com/purerl/purescript-erl-lager.git
+        version: v0.0.1
+        dependencies:
+          - erl-lists
+      erl-lists:
+        repo: https://github.com/purerl/purescript-erl-lists.git
+        version: v4.0.1
+        dependencies:
+          - prelude
+          - foldable-traversable
+          - unfoldable
+          - filterable
+          - tuples
+      erl-logger:
+        repo: https://github.com/id3as/purescript-erl-logger.git
+        version: v0.0.3
+        dependencies:
+          - prelude
+          - erl-atom
+          - erl-lists
+          - record
+      erl-maps:
+        repo: https://github.com/purerl/purescript-erl-maps.git
+        version: v0.5.0
+        dependencies:
+          - erl-lists
+          - functions
+          - prelude
+          - tuples
+          - unfoldable
+      erl-modules:
+        repo: https://github.com/purerl/purescript-erl-modules.git
+        version: v0.1.6
+        dependencies:
+          - erl-atom
+          - prelude
+          - strings
+      erl-nativerefs:
+        repo: https://github.com/id3as/purescript-erl-nativerefs.git
+        version: v0.1.0
+        dependencies:
+          - prelude
+          - effect
+          - erl-tuples
+      erl-opentelemetry:
+        repo: https://github.com/id3as/purescript-erl-opentelemetry.git
+        version: v0.0.1
+        dependencies:
+          - effect
+          - erl-atom
+          - erl-lists
+          - erl-maps
+          - erl-tuples
+          - erl-untagged-union
+          - maybe
+          - prelude
+          - tuples
+          - unsafe-reference
+      erl-otp-types:
+        repo: https://github.com/id3as/purescript-erl-otp-types.git
+        version: v0.0.2
+        dependencies:
+          - erl-atom
+          - erl-binary
+          - erl-kernel
+          - foreign
+          - prelude
+          - unsafe-reference
+      erl-pinto:
+        repo: https://github.com/id3as/purescript-erl-pinto.git
+        version: v0.2.0
+        dependencies:
+          - erl-process
+          - erl-lists
+          - erl-atom
+          - erl-kernel
+          - datetime
+          - erl-tuples
+          - erl-modules
+          - foreign
+      erl-process:
+        repo: https://github.com/purerl/purescript-erl-process.git
+        version: v3.3.0
+        dependencies:
+          - datetime
+          - effect
+          - either
+          - foreign
+          - integers
+          - prelude
+      erl-queue:
+        repo: https://github.com/id3as/purescript-erl-queue.git
+        version: v0.0.2
+        dependencies:
+          - control
+          - either
+          - erl-lists
+          - filterable
+          - foldable-traversable
+          - lists
+          - maybe
+          - newtype
+          - nonempty
+          - prelude
+          - tuples
+          - unfoldable
+      erl-ranch:
+        repo: https://github.com/id3as/purescript-erl-ranch.git
+        version: v0.0.2
+        dependencies:
+          - convertable-options
+          - effect
+          - either
+          - erl-atom
+          - erl-kernel
+          - erl-lists
+          - erl-maps
+          - erl-otp-types
+          - erl-process
+          - erl-ssl
+          - erl-tuples
+          - exceptions
+          - foreign
+          - maybe
+          - prelude
+          - record
+          - typelevel-prelude
+          - unsafe-coerce
+      erl-simplebus:
+        repo: https://github.com/id3as/purescript-erl-simplebus.git
+        version: v0.0.3
+        dependencies:
+          - effect
+          - erl-process
+          - maybe
+          - newtype
+          - prelude
+      erl-ssl:
+        repo: https://github.com/id3as/purescript-erl-ssl.git
+        version: v0.0.2
+        dependencies:
+          - convertable-options
+          - datetime
+          - effect
+          - either
+          - maybe
+          - erl-atom
+          - erl-binary
+          - erl-lists
+          - erl-kernel
+          - erl-tuples
+          - erl-logger
+          - erl-otp-types
+          - foreign
+          - maybe
+          - partial
+          - prelude
+          - record
+          - unsafe-reference
+      erl-stetson:
+        repo: https://github.com/id3as/purescript-erl-stetson.git
+        version: v0.13.0
+        dependencies:
+          - erl-atom
+          - erl-binary
+          - erl-lists
+          - erl-maps
+          - erl-tuples
+          - erl-modules
+          - erl-cowboy
+          - foreign
+          - maybe
+          - prelude
+          - transformers
+          - routing-duplex
+      erl-test-eunit:
+        repo: https://github.com/id3as/purescript-erl-test-eunit.git
+        version: v0.0.4
+        dependencies:
+          - assert
+          - console
+          - debug
+          - erl-lists
+          - erl-tuples
+          - erl-atom
+          - foreign
+          - free
+          - prelude
+          - psci-support
+      erl-test-eunit-discovery:
+        repo: https://github.com/id3as/purescript-erl-test-eunit-discovery.git
+        version: d0b6d9f5bcab13f79c3941c64e52ee86f7cd4e2b
+        dependencies:
+          - effect
+          - erl-lists
+          - erl-modules
+          - erl-test-eunit
+          - filterable
+          - foldable-traversable
+          - maybe
+          - free
+          - prelude
+      erl-tuples:
+        repo: https://github.com/purerl/purescript-erl-tuples.git
+        version: v3.3.1
+        dependencies:
+          - unfoldable
+          - tuples
+      erl-untagged-union:
+        repo: https://github.com/id3as/purescript-erl-untagged-union.git
+        version: v0.0.2
+        dependencies:
+          - erl-atom
+          - erl-binary
+          - erl-lists
+          - erl-tuples
+          - foreign
+          - typelevel-prelude
+          - maybe
+          - partial
+          - prelude
+          - unsafe-coerce
+          - erl-process
+      exceptions:
+        repo: https://github.com/purerl/purescript-exceptions.git
+        version: v5.0.0-erl1
+        dependencies:
+          - maybe
+          - either
+          - effect
+      exists:
+        repo: https://github.com/purescript/purescript-exists.git
+        version: v5.1.0
+        dependencies:
+          - unsafe-coerce
+      expect-inferred:
+        repo: https://github.com/justinwoo/purescript-expect-inferred
+        version: v2.0.0
+        dependencies:
+          - prelude
+          - typelevel-prelude
+      filterable:
+        repo: https://github.com/purescript/purescript-filterable.git
+        version: v3.0.1
+        dependencies:
+          - arrays
+          - either
+          - foldable-traversable
+          - identity
+          - lists
+          - ordered-collections
+      foldable-traversable:
+        repo: https://github.com/purerl/purescript-foldable-traversable.git
+        version: v5.0.1-erl1
+        dependencies:
+          - bifunctors
+          - const
+          - control
+          - either
+          - functors
+          - identity
+          - maybe
+          - newtype
+          - orders
+          - prelude
+          - tuples
+      foreign:
+        repo: https://github.com/purerl/purescript-foreign.git
+        version: v6.0.1-erl1
+        dependencies:
+          - either
+          - functions
+          - identity
+          - integers
+          - lists
+          - maybe
+          - prelude
+          - strings
+          - transformers
+      formatters:
+        repo: https://github.com/id3as/purescript-formatters
+        version: v5.0.1-erl1
+        dependencies:
+          - arrays
+          - bifunctors
+          - control
+          - datetime
+          - either
+          - enums
+          - foldable-traversable
+          - integers
+          - lists
+          - math
+          - maybe
+          - newtype
+          - numbers
+          - ordered-collections
+          - parsing
+          - partial
+          - prelude
+          - psci-support
+          - strings
+          - transformers
+          - tuples
+      free:
+        repo: https://github.com/purescript/purescript-free.git
+        version: v6.0.1
+        dependencies:
+          - catenable-lists
+          - control
+          - distributive
+          - either
+          - exists
+          - foldable-traversable
+          - invariant
+          - lazy
+          - maybe
+          - prelude
+          - tailrec
+          - transformers
+          - tuples
+          - unsafe-coerce
+      functions:
+        repo: https://github.com/purerl/purescript-functions.git
+        version: v5.0.0-erl1
+        dependencies:
+          - prelude
+      functors:
+        repo: https://github.com/purescript/purescript-functors.git
+        version: v4.1.1
+        dependencies:
+          - bifunctors
+          - const
+          - contravariant
+          - control
+          - distributive
+          - either
+          - invariant
+          - maybe
+          - newtype
+          - prelude
+          - profunctor
+          - tuples
+          - unsafe-coerce
+      gen:
+        repo: https://github.com/purescript/purescript-gen.git
+        version: v3.0.0
+        dependencies:
+          - either
+          - foldable-traversable
+          - identity
+          - maybe
+          - newtype
+          - nonempty
+          - prelude
+          - tailrec
+          - tuples
+          - unfoldable
+      graphs:
+        repo: https://github.com/purescript/purescript-graphs.git
+        version: v5.0.0
+        dependencies:
+          - catenable-lists
+          - ordered-collections
+      heterogeneous:
+        repo: https://github.com/natefaubion/purescript-heterogeneous.git
+        version: v0.5.1
+        dependencies:
+          - prelude
+          - record
+          - tuples
+          - functors
+          - variant
+          - either
+      identity:
+        repo: https://github.com/purescript/purescript-identity.git
+        version: v5.0.0
+        dependencies:
+          - control
+          - invariant
+          - newtype
+          - prelude
+      integers:
+        repo: https://github.com/purerl/purescript-integers.git
+        version: v5.0.0-erl1
+        dependencies:
+          - math
+          - maybe
+          - numbers
+          - prelude
+      invariant:
+        repo: https://github.com/purescript/purescript-invariant.git
+        version: v5.0.0
+        dependencies:
+          - control
+          - prelude
+      js-uri:
+        repo: https://github.com/purerl/purescript-js-uri.git
+        version: v2.0.0-erl1
+        dependencies:
+          - functions
+          - maybe
+      lazy:
+        repo: https://github.com/purerl/purescript-lazy.git
+        version: v5.0.0-erl1
+        dependencies:
+          - control
+          - foldable-traversable
+          - invariant
+          - prelude
+      lcg:
+        repo: https://github.com/purescript/purescript-lcg.git
+        version: v3.0.0
+        dependencies:
+          - effect
+          - integers
+          - math
+          - maybe
+          - partial
+          - prelude
+          - random
+      lists:
+        repo: https://github.com/purescript/purescript-lists.git
+        version: v6.0.1
+        dependencies:
+          - bifunctors
+          - control
+          - foldable-traversable
+          - lazy
+          - maybe
+          - newtype
+          - nonempty
+          - partial
+          - prelude
+          - tailrec
+          - tuples
+          - unfoldable
+      math:
+        repo: https://github.com/purerl/purescript-math.git
+        version: v3.0.0-erl1
+        dependencies: []
+      maybe:
+        repo: https://github.com/purescript/purescript-maybe.git
+        version: v5.0.0
+        dependencies:
+          - control
+          - invariant
+          - newtype
+          - prelude
+      media-types:
+        repo: https://github.com/purescript-contrib/purescript-media-types.git
+        version: v5.0.0
+        dependencies:
+          - prelude
+          - newtype
+      metadata:
+        repo: https://github.com/spacchetti/purescript-metadata.git
+        version: v0.15.0
+        dependencies: []
+      newtype:
+        repo: https://github.com/purescript/purescript-newtype.git
+        version: v4.0.0
+        dependencies:
+          - prelude
+          - safe-coerce
+      nonempty:
+        repo: https://github.com/purescript/purescript-nonempty.git
+        version: v6.0.0
+        dependencies:
+          - control
+          - foldable-traversable
+          - maybe
+          - prelude
+          - tuples
+          - unfoldable
+      nullable:
+        repo: https://github.com/purerl/purescript-nullable.git
+        version: v5.0.0-erl1
+        dependencies:
+          - maybe
+          - functions
+      numbers:
+        repo: https://github.com/purerl/purescript-numbers.git
+        version: v8.0.0-erl1
+        dependencies:
+          - functions
+          - math
+          - maybe
+      ordered-collections:
+        repo: https://github.com/purerl/purescript-ordered-collections.git
+        version: v2.0.2-erl1
+        dependencies:
+          - arrays
+          - foldable-traversable
+          - gen
+          - lists
+          - maybe
+          - partial
+          - prelude
+          - tailrec
+          - tuples
+          - unfoldable
+          - unsafe-coerce
+      orders:
+        repo: https://github.com/purescript/purescript-orders.git
+        version: v5.0.0
+        dependencies:
+          - newtype
+          - prelude
+      parallel:
+        repo: https://github.com/purescript/purescript-parallel.git
+        version: v5.0.0
+        dependencies:
+          - control
+          - effect
+          - either
+          - foldable-traversable
+          - functors
+          - maybe
+          - newtype
+          - prelude
+          - profunctor
+          - refs
+          - transformers
+      parsing:
+        repo: https://github.com/id3as/purescript-parsing
+        version: v6.0.2-erl1
+        dependencies:
+          - arrays
+          - assert
+          - console
+          - control
+          - effect
+          - either
+          - foldable-traversable
+          - identity
+          - integers
+          - lists
+          - math
+          - maybe
+          - newtype
+          - prelude
+          - psci-support
+          - strings
+          - tailrec
+          - transformers
+          - tuples
+          - unicode
+      partial:
+        repo: https://github.com/purerl/purescript-partial.git
+        version: v3.0.0-erl2
+        dependencies: []
+      pathy:
+        repo: https://github.com/id3as/purescript-pathy
+        version: v8.1.0-erl1
+        dependencies:
+          - arrays
+          - either
+          - exceptions
+          - foldable-traversable
+          - gen
+          - identity
+          - lists
+          - maybe
+          - newtype
+          - nonempty
+          - partial
+          - prelude
+          - psci-support
+          - strings
+          - tailrec
+          - tuples
+          - typelevel-prelude
+          - unsafe-coerce
+      prelude:
+        repo: https://github.com/purerl/purescript-prelude.git
+        version: v5.0.1-erl1
+        dependencies: []
+      profunctor:
+        repo: https://github.com/purescript/purescript-profunctor.git
+        version: v5.0.0
+        dependencies:
+          - control
+          - distributive
+          - either
+          - exists
+          - invariant
+          - newtype
+          - prelude
+          - tuples
+      profunctor-lenses:
+        repo: https://github.com/purerl/purescript-profunctor-lenses.git
+        version: v8.0.0-erl1
+        dependencies:
+          - arrays
+          - bifunctors
+          - const
+          - control
+          - distributive
+          - either
+          - foldable-traversable
+          - functors
+          - identity
+          - lists
+          - maybe
+          - newtype
+          - ordered-collections
+          - partial
+          - prelude
+          - profunctor
+          - record
+          - transformers
+          - tuples
+          - erl-maps
+      psci-support:
+        repo: https://github.com/purescript/purescript-psci-support.git
+        version: v5.0.0
+        dependencies:
+          - console
+          - effect
+          - prelude
+      quickcheck:
+        repo: https://github.com/purerl/purescript-quickcheck.git
+        version: v7.1.0-erl1
+        dependencies:
+          - arrays
+          - console
+          - control
+          - effect
+          - either
+          - enums
+          - exceptions
+          - foldable-traversable
+          - gen
+          - identity
+          - integers
+          - lazy
+          - lcg
+          - lists
+          - math
+          - maybe
+          - newtype
+          - nonempty
+          - partial
+          - prelude
+          - record
+          - strings
+          - tailrec
+          - transformers
+          - tuples
+          - unfoldable
+      quickcheck-laws:
+        repo: https://github.com/purescript-contrib/purescript-quickcheck-laws
+        version: v6.0.1
+        dependencies:
+          - arrays
+          - console
+          - control
+          - effect
+          - either
+          - enums
+          - foldable-traversable
+          - identity
+          - lists
+          - maybe
+          - newtype
+          - prelude
+          - quickcheck
+          - tuples
+      random:
+        repo: https://github.com/purerl/purescript-random.git
+        version: v5.0.0-erl1
+        dependencies:
+          - effect
+          - integers
+          - math
+      rationals:
+        repo: https://github.com/anttih/purescript-rationals.git
+        version: c883c972513380ae161d816ed42108acfe8cc8f6
+        dependencies:
+          - prelude
+          - integers
+      record:
+        repo: https://github.com/purerl/purescript-record.git
+        version: v3.0.0-erl1
+        dependencies:
+          - functions
+          - typelevel-prelude
+          - unsafe-coerce
+      record-prefix:
+        repo: https://github.com/dariooddenino/purescript-record-prefix.git
+        version: v1.0.0
+        dependencies:
+          - prelude
+          - heterogeneous
+          - console
+          - typelevel-prelude
+      refs:
+        repo: https://github.com/purerl/purescript-refs.git
+        version: v5.0.0-erl2
+        dependencies:
+          - effect
+          - prelude
+      routing-duplex:
+        repo: https://github.com/natefaubion/purescript-routing-duplex.git
+        version: v0.5.0
+        dependencies:
+          - arrays
+          - control
+          - either
+          - js-uri
+          - lazy
+          - numbers
+          - prelude
+          - profunctor
+          - record
+          - strings
+          - typelevel-prelude
+      safe-coerce:
+        repo: https://github.com/purescript/purescript-safe-coerce.git
+        version: v1.0.0
+        dependencies:
+          - unsafe-coerce
+      semirings:
+        repo: https://github.com/purescript/purescript-semirings.git
+        version: v6.0.0
+        dependencies:
+          - foldable-traversable
+          - lists
+          - newtype
+          - prelude
+      sequences:
+        repo: https://github.com/hdgarrood/purescript-sequences.git
+        version: v3.0.2
+        dependencies:
+          - prelude
+          - unsafe-coerce
+          - partial
+          - unfoldable
+          - lazy
+          - arrays
+          - profunctor
+          - maybe
+          - tuples
+          - newtype
+      simple-json:
+        repo: https://github.com/purerl/purescript-simple-json.git
+        version: baad5dd0d613df6fb2f054fd241d46e11a92e181
+        dependencies:
+          - exceptions
+          - foreign
+          - nullable
+          - prelude
+          - record
+          - typelevel-prelude
+          - variant
+          - erl-lists
+          - erl-maps
+          - erl-kernel
+      simple-json-generics:
+        repo: https://github.com/justinwoo/purescript-simple-json-generics
+        version: v0.1.0
+        dependencies:
+          - prelude
+          - simple-json
+      strings:
+        repo: https://github.com/purerl/purescript-strings.git
+        version: v5.0.0-erl2
+        dependencies:
+          - arrays
+          - control
+          - either
+          - enums
+          - foldable-traversable
+          - gen
+          - integers
+          - maybe
+          - newtype
+          - nonempty
+          - partial
+          - prelude
+          - tailrec
+          - tuples
+          - unfoldable
+          - unsafe-coerce
+      tailrec:
+        repo: https://github.com/purerl/purescript-tailrec.git
+        version: v5.0.1-erl1
+        dependencies:
+          - bifunctors
+          - effect
+          - either
+          - identity
+          - maybe
+          - partial
+          - prelude
+          - refs
+      these:
+        repo: https://github.com/purescript-contrib/purescript-these.git
+        version: v5.0.0
+        dependencies:
+          - arrays
+          - gen
+          - lists
+          - quickcheck
+          - quickcheck-laws
+          - tuples
+      transformers:
+        repo: https://github.com/purescript/purescript-transformers.git
+        version: v5.2.0
+        dependencies:
+          - control
+          - distributive
+          - effect
+          - either
+          - exceptions
+          - foldable-traversable
+          - identity
+          - lazy
+          - maybe
+          - newtype
+          - prelude
+          - tailrec
+          - tuples
+          - unfoldable
+      tuples:
+        repo: https://github.com/purescript/purescript-tuples.git
+        version: v6.0.1
+        dependencies:
+          - control
+          - invariant
+          - prelude
+      type-equality:
+        repo: https://github.com/purescript/purescript-type-equality.git
+        version: v4.0.0
+        dependencies: []
+      typelevel-prelude:
+        repo: https://github.com/purescript/purescript-typelevel-prelude.git
+        version: v6.0.0
+        dependencies:
+          - prelude
+          - type-equality
+      undefinable:
+        repo: https://github.com/purerl/purescript-undefinable.git
+        version: v4.0.0-erl1
+        dependencies:
+          - maybe
+          - functions
+      unfoldable:
+        repo: https://github.com/purerl/purescript-unfoldable.git
+        version: v5.0.0-erl1
+        dependencies:
+          - foldable-traversable
+          - maybe
+          - partial
+          - prelude
+          - tuples
+      unicode:
+        repo: https://github.com/id3as/purescript-unicode
+        version: v5.0.0-erl1
+        dependencies:
+          - foldable-traversable
+          - maybe
+          - psci-support
+          - strings
+      unsafe-coerce:
+        repo: https://github.com/purerl/purescript-unsafe-coerce.git
+        version: v5.0.0-erl1
+        dependencies: []
+      unsafe-reference:
+        repo: https://github.com/purerl/purescript-unsafe-reference.git
+        version: v4.0.0-erl1
+        dependencies:
+          - prelude
+      uri:
+        repo: https://github.com/purescript-contrib/purescript-uri
+        version: v8.0.1
+        dependencies:
+          - arrays
+          - integers
+          - js-uri
+          - numbers
+          - parsing
+          - prelude
+          - profunctor-lenses
+          - these
+          - transformers
+          - unfoldable
+      validation:
+        repo: https://github.com/purescript/purescript-validation.git
+        version: v5.0.0
+        dependencies:
+          - bifunctors
+          - control
+          - either
+          - foldable-traversable
+          - newtype
+          - prelude
+      variant:
+        repo: https://github.com/natefaubion/purescript-variant.git
+        version: v7.0.3
+        dependencies:
+          - enums
+          - lists
+          - maybe
+          - partial
+          - prelude
+          - record
+          - tuples
+          - unsafe-coerce
+  extra_packages: {}
+packages:
+  arrays:
+    type: git
+    url: https://github.com/purerl/purescript-arrays.git
+    rev: 24ac35d3598af6bfb5e479d313f9493ab4d62984
+    dependencies:
+      - bifunctors
+      - control
+      - foldable-traversable
+      - maybe
+      - nonempty
+      - partial
+      - prelude
+      - tailrec
+      - tuples
+      - unfoldable
+      - unsafe-coerce
+  assert:
+    type: git
+    url: https://github.com/purerl/purescript-assert.git
+    rev: b3f25ea1b27e64881c99032a5ec8d461b4491e25
+    dependencies:
+      - console
+      - effect
+      - prelude
+  bifunctors:
+    type: git
+    url: https://github.com/purescript/purescript-bifunctors.git
+    rev: a31d0fc4bbebf19d5e9b21b65493c28b8d3fba62
+    dependencies:
+      - const
+      - either
+      - newtype
+      - prelude
+      - tuples
+  console:
+    type: git
+    url: https://github.com/purerl/purescript-console.git
+    rev: 56cfd5294acb79758cf30b357751f624650f18e3
+    dependencies:
+      - effect
+      - prelude
+  const:
+    type: git
+    url: https://github.com/purescript/purescript-const.git
+    rev: 3a3a4bdc44f71311cf27de9bd22039b110277540
+    dependencies:
+      - invariant
+      - newtype
+      - prelude
+  contravariant:
+    type: git
+    url: https://github.com/purescript/purescript-contravariant.git
+    rev: ae1a765f7ddbfd96ae1f12e399e46d554d8e3b38
+    dependencies:
+      - const
+      - either
+      - newtype
+      - prelude
+      - tuples
+  control:
+    type: git
+    url: https://github.com/purerl/purescript-control.git
+    rev: e3add624f8dacb4d6bec6d9ed682df692e197b5b
+    dependencies:
+      - newtype
+      - prelude
+  debug:
+    type: git
+    url: https://github.com/purerl/purescript-debug.git
+    rev: 3f6d18679e224249685bc690dfd5f0884a580374
+    dependencies:
+      - prelude
+  distributive:
+    type: git
+    url: https://github.com/purescript/purescript-distributive.git
+    rev: 11f3f87ca5720899e1739cedb58dd6227cae6ad5
+    dependencies:
+      - identity
+      - newtype
+      - prelude
+      - tuples
+      - type-equality
+  effect:
+    type: git
+    url: https://github.com/purerl/purescript-effect.git
+    rev: 69ba78cd96a27a0af6a723d255dc05a32c6eaa43
+    dependencies:
+      - prelude
+  either:
+    type: git
+    url: https://github.com/purescript/purescript-either.git
+    rev: c1a1af35684f10eecaf6ac7d38dbf6bd48af2ced
+    dependencies:
+      - control
+      - invariant
+      - maybe
+      - prelude
+  enums:
+    type: git
+    url: https://github.com/purerl/purescript-enums.git
+    rev: 9c3ec61d03c04642af91e2ac72500cdd6009bd98
+    dependencies:
+      - control
+      - either
+      - gen
+      - maybe
+      - newtype
+      - nonempty
+      - partial
+      - prelude
+      - tuples
+      - unfoldable
+  exists:
+    type: git
+    url: https://github.com/purescript/purescript-exists.git
+    rev: c34820f8b2d15be29abdd5097c3d636f5df8f28c
+    dependencies:
+      - unsafe-coerce
+  foldable-traversable:
+    type: git
+    url: https://github.com/purerl/purescript-foldable-traversable.git
+    rev: 444a611d64800a82259b9c22999330b6a7b48a3d
+    dependencies:
+      - bifunctors
+      - const
+      - control
+      - either
+      - functors
+      - identity
+      - maybe
+      - newtype
+      - orders
+      - prelude
+      - tuples
+  functions:
+    type: git
+    url: https://github.com/purerl/purescript-functions.git
+    rev: 6f0854f056b5295835db2cc3d06bf8763c181536
+    dependencies:
+      - prelude
+  functors:
+    type: git
+    url: https://github.com/purescript/purescript-functors.git
+    rev: e936f7a8d2ec53a344c478ccada5add93273848c
+    dependencies:
+      - bifunctors
+      - const
+      - contravariant
+      - control
+      - distributive
+      - either
+      - invariant
+      - maybe
+      - newtype
+      - prelude
+      - profunctor
+      - tuples
+      - unsafe-coerce
+  gen:
+    type: git
+    url: https://github.com/purescript/purescript-gen.git
+    rev: 85c369f56545a3de834b7e7475a56bc9193bb4b4
+    dependencies:
+      - either
+      - foldable-traversable
+      - identity
+      - maybe
+      - newtype
+      - nonempty
+      - prelude
+      - tailrec
+      - tuples
+      - unfoldable
+  identity:
+    type: git
+    url: https://github.com/purescript/purescript-identity.git
+    rev: 5c150ac5ee4fa6f145932f6322a1020463dae8e9
+    dependencies:
+      - control
+      - invariant
+      - newtype
+      - prelude
+  integers:
+    type: git
+    url: https://github.com/purerl/purescript-integers.git
+    rev: 5549373344321575727cc1b3526ee946cff77a43
+    dependencies:
+      - math
+      - maybe
+      - numbers
+      - prelude
+  invariant:
+    type: git
+    url: https://github.com/purescript/purescript-invariant.git
+    rev: c421b49dec7a1511073bb408a08bdd8c9d17d7b1
+    dependencies:
+      - control
+      - prelude
+  math:
+    type: git
+    url: https://github.com/purerl/purescript-math.git
+    rev: c4760c2620980dbd7168b17ed21dfab12b8c5b39
+    dependencies: []
+  maybe:
+    type: git
+    url: https://github.com/purescript/purescript-maybe.git
+    rev: 8e96ca0187208e78e8df6a464c281850e5c9400c
+    dependencies:
+      - control
+      - invariant
+      - newtype
+      - prelude
+  newtype:
+    type: git
+    url: https://github.com/purescript/purescript-newtype.git
+    rev: 7b292fcd2ac7c4a25d7a7a8d3387d0ee7de89b13
+    dependencies:
+      - prelude
+      - safe-coerce
+  nonempty:
+    type: git
+    url: https://github.com/purescript/purescript-nonempty.git
+    rev: d3e91e3d6e06e5bdcc5b2c21c8e5d0f9b946bb9e
+    dependencies:
+      - control
+      - foldable-traversable
+      - maybe
+      - prelude
+      - tuples
+      - unfoldable
+  numbers:
+    type: git
+    url: https://github.com/purerl/purescript-numbers.git
+    rev: 5446bc018f2970d91a8573c3424bba0b59305a21
+    dependencies:
+      - functions
+      - math
+      - maybe
+  orders:
+    type: git
+    url: https://github.com/purescript/purescript-orders.git
+    rev: c25b7075426cf82bcb960495f28d2541c9a75510
+    dependencies:
+      - newtype
+      - prelude
+  partial:
+    type: git
+    url: https://github.com/purerl/purescript-partial.git
+    rev: 6fe347eb3a36c70cacd4aeb581b5748a9d5035aa
+    dependencies: []
+  prelude:
+    type: git
+    url: https://github.com/purerl/purescript-prelude.git
+    rev: 75a86f361270985ae983b59d4a69c0513b7f1cb1
+    dependencies: []
+  profunctor:
+    type: git
+    url: https://github.com/purescript/purescript-profunctor.git
+    rev: 4551b8e437a00268cc9b687cbe691d75e812e82b
+    dependencies:
+      - control
+      - distributive
+      - either
+      - exists
+      - invariant
+      - newtype
+      - prelude
+      - tuples
+  refs:
+    type: git
+    url: https://github.com/purerl/purescript-refs.git
+    rev: 1a921991d2c0900c4582d69586bfbd5ce3d53952
+    dependencies:
+      - effect
+      - prelude
+  safe-coerce:
+    type: git
+    url: https://github.com/purescript/purescript-safe-coerce.git
+    rev: e719defd227d932da067a1f0d62a60b3d3ff3637
+    dependencies:
+      - unsafe-coerce
+  tailrec:
+    type: git
+    url: https://github.com/purerl/purescript-tailrec.git
+    rev: a865d0787fef54e7350d8c1e8d2e9ed94fae47b7
+    dependencies:
+      - bifunctors
+      - effect
+      - either
+      - identity
+      - maybe
+      - partial
+      - prelude
+      - refs
+  tuples:
+    type: git
+    url: https://github.com/purescript/purescript-tuples.git
+    rev: d4fe8ffe9e8c512111ee0bc18a6ba0fd056a6773
+    dependencies:
+      - control
+      - invariant
+      - prelude
+  type-equality:
+    type: git
+    url: https://github.com/purescript/purescript-type-equality.git
+    rev: f7644468f22ed267a15d398173d234fa6f45e2e0
+    dependencies: []
+  unfoldable:
+    type: git
+    url: https://github.com/purerl/purescript-unfoldable.git
+    rev: 5d3b6ac48757c9aa93f6410f86266034fd510599
+    dependencies:
+      - foldable-traversable
+      - maybe
+      - partial
+      - prelude
+      - tuples
+  unsafe-coerce:
+    type: git
+    url: https://github.com/purerl/purescript-unsafe-coerce.git
+    rev: 7150d261d40cd92112e8c2064124c5682627f137
+    dependencies: []
diff --git a/spago.yaml b/spago.yaml
new file mode 100644
index 0000000..c3f411c
--- /dev/null
+++ b/spago.yaml
@@ -0,0 +1,32 @@
+
+package:
+  name: strings
+  dependencies:
+    - arrays
+    - control
+    - either
+    - enums
+    - foldable-traversable
+    - gen
+    - integers
+    - maybe
+    - newtype
+    - nonempty
+    - partial
+    - prelude
+    - tailrec
+    - tuples
+    - unfoldable
+    - unsafe-coerce
+  test:
+    main: Test.Main
+    dependencies:
+      - assert
+      - debug
+workspace:
+  package_set:
+    url: https://raw.githubusercontent.com/purerl/package-sets/erl-0.15.3-20220629/packages.json
+    hash: sha256-kLmZv2u5dWVUUaQEwK0b3T1Ghce5a/hG0zlizaYfcXs=
+  extra_packages: {}
+  backend:
+    cmd: purerl
diff --git a/src/Data/String/Regex.erl b/src/Data/String/Regex.erl
index d03ac6f..3bda113 100644
--- a/src/Data/String/Regex.erl
+++ b/src/Data/String/Regex.erl
@@ -7,7 +7,8 @@ flags_to_options([], Acc) -> {opts, Acc};
 flags_to_options([$g|Flags], Acc) -> flags_to_options(Flags, Acc);
 flags_to_options([$i|Flags], Acc) -> flags_to_options(Flags, [caseless|Acc]);
 flags_to_options([$m|Flags], Acc) -> flags_to_options(Flags, [multiline|Acc]);
-flags_to_options([$y|Flags], Acc) -> flags_to_options(Flags, Acc);
+flags_to_options([$s|Flags], Acc) -> flags_to_options(Flags, [dotall|Acc]);
+flags_to_options([$y|Flags], Acc) -> flags_to_options(Flags, [anchored|Acc]); %% this is basically sticky given there is no way to advance the index
 flags_to_options([$u|Flags], Acc) -> flags_to_options(Flags, [ucp|[unicode|Acc]]);
 flags_to_options(_,_) -> err.
 
diff --git a/test/Test/Data/String.purs b/test/Test/Data/String.purs
index 4f69455..ae9344d 100644
--- a/test/Test/Data/String.purs
+++ b/test/Test/Data/String.purs
@@ -118,6 +118,12 @@ testString = do
     , expected: "abc"
     }
 
+  log "trim multiline"
+  assertEqual
+    { actual: S.trim "  abc\n def \n"
+    , expected: "abc\n def"
+    }
+
   log "joinWith"
   assertEqual
     { actual: S.joinWith "" []