Fix incorrect regex usage instructions

docs/directives/try_examples.md

@@ -240,28 +240,31 @@ The format is a list of
 
 ```json
 {
-    "ignore_patterns": ["^/latest/.*", "^/stable/reference/generated/example.html"]
+    "ignore_patterns": ["^\/latest/.*", "^\/stable\/reference\/generated\/example.html"]
 }
 ```
 
 `TryExamples` buttons will be hidden in url pathnames matching at least one of these
 patterns, effectively disabling the interactive documentation. In the provided example:
 
-* The pattern `"^/latest/.*"` disables interactive examples for urls for the documentation
+* The pattern `"^\/latest\/.*"` disables interactive examples for urls for the documentation
   for the latest version of the package, which may be useful if this documentation is
   for a development version for which a corresponding package build is not available
-  in a Jupyterlite kernel.
+  in a JupyterLite kernel.
 
-* The pattern `"^/stable/reference/generated/example.html"` targets a particular url
+* The pattern `"^\/stable\/reference\/generated\/example.html"` targets a particular url
   in the documentation for the latest stable release.
 
 Note that these patterns should match the [pathname](https://developer.mozilla.org/en-US/docs/Web/API/Location/pathname) of the url, not the full url. This is the path portion of
-the url. For instance, the pathname of https://jupyterlite-sphinx.readthedocs.io/en/latest/directives/try_examples.html is `/en/latest/directives/try_examples.html`.
+the url. For instance, the pathname of https://jupyterlite-sphinx.readthedocs.io/en/latest/directives/try_examples.html is `/en/latest/directives/try_examples.html`. Also, note that since these are JavaScript-based regular
+expressions, to use special characters in the regular expression (such as `/`), they
+must be escaped with a backslash (`\`).
 
 Again, the configuration file can be added or edited within the deployed documentation,
 allowing for disabling or enabling examples without rebuilding the documentation.
 
 #### "global_min_height"
+
 To avoid having unusably small notebooks for very small examples due to the default of
 having the embedded notebooks' iframe containers take the same amount of space as the
 rendered content they replace, users can set a global minimum height in