Merge pull request #280 from AdguardTeam/gh-1013-replace-modifier-des…

…cription

[GH-1013] Ignoring rules

docs/general/ad-filtering/create-own-filters.md

@@ -71,7 +71,7 @@ Filtering rules support numerous modifiers that allow you to fine-tune the rule
 
 **This rule blocks:**
 
-- `http://example.org/script.js` if this script is loaded from `example.org`.
+- `http://example.org/script.js` if this script is loaded from `example.com`.
 
 **This rule does not block:**
 
@@ -204,6 +204,68 @@ AdGuard Safari and AdGuard for iOS do not fully support regular expressions beca
 
 :::
 
+### Restrictions on rules application {#rules-restrictions}
+
+Rules that match an arbitrarily large number of URLs are considered incorrect and will be ignored. This can happen if the rule doesn't contain a mask, or if the mask matches any URL with a certain protocol.
+
+This rule will be ignored:
+
+```text
+|http://$replace=/a/b/
+```
+
+This limitation can be circumvented by using a `/.*/` regular expression inside the mask.
+
+This rule will not be ignored:
+
+```text
+/.*/$replace=/a/b/
+```
+
+**Exceptions**
+
+This rule validation is not applied in the following cases:
+
+1. The rule contains [`$domain`](#domain-modifier) modifier that points to a specific domain list.
+
+    These rules will not be ignored:
+
+    ```text
+    $domain=example.com,script
+    $domain=example.*,script
+    ```
+
+    This rule will be ignored because of domain negation, which causes too wide of a rule application scope:
+
+    ```text
+    $domain=~example.com,script
+    ```
+
+1. The rule contains [`$app`](#app-modifier) modifier that points to a specific app list.
+
+    This rule will not be ignored:
+
+    ```text
+    $app=curl,document
+    ```
+
+    This rule will be ignored because of app negation, which causes too wide of a rule application scope:
+
+    ```text
+    $app=~curl,document
+    ```
+
+1. The rule contains one or more modifiers from among [`$cookie`](#cookie-modifier), [`$removeparam`](#removeparam-modifier), [`$removeheader`](#removeheader-modifier), [`$stealth`](#stealth-modifier).
+
+    These rules will not be ignored:
+
+    ```text
+    $removeparam=cx_recsWidget
+    $cookie=ibbid
+    $removeheader=location
+    $stealth
+    ```
+
 ### Wildcard support for TLD (top-level domains) {#wildcard-for-tld}
 
 Wildcard characters are supported for TLDs of the domains in patterns of [cosmetic](#cosmetic-rules), [HTML filtering](#html-filtering-rules) and [JavaScript](#javascript-rules) rules.