Clarify behavior of transformIgnorePatterns when including multiple patterns.

docs/Configuration.md

@@ -1367,7 +1367,13 @@ If the tests are written using [native ESM](ECMAScriptModules.md) the transforme
 
 Default: `["/node_modules/", "\\.pnp\\.[^\\\/]+$"]`
 
-An array of regexp pattern strings that are matched against all source file paths before transformation. If the file path matches any of the patterns, it will not be transformed.
+An array of regexp pattern strings that are matched against all source file paths before transformation. If the file path matches **any** of the patterns, it will not be transformed.
+
+Patterns that overlap with each other may result in a file not being transformed unexpectedly. For example:
+
+`["/node_modules/(?!foo|bar)", ".*/bar/"]`
+
+The first matches any `node_modules` folders except for `node_modules/foo` and `node_modules/bar`, but the second one matches any with `bar` in the path. In this case, `node_modules/bar` will not be transformed.
 
 These pattern strings match against the full path. Use the `<rootDir>` string token to include the path to your project's root directory to prevent it from accidentally ignoring all of your files in different environments that may have different root directories.
 

docs/TutorialReactNative.md

@@ -148,6 +148,19 @@ By default the jest-react-native preset only processes the project's own source
 }
 ```
 
+Because `transformIgnorePatterns` will not transform a file if it matches **any** pattern provided, it is necessary to only use the above exclusion pattern only once. Otherwise, a folder that doesn't match in one pattern will match in the other. In the example below, neither module will be transformed:
+
+```json
+{
+  "transformIgnorePatterns": [
+    "node_modules/(?!(foo)/)",
+    "node_modules/(?!(bar)/)"
+  ]
+}
+```
+
+
+
 ### setupFiles
 
 If you'd like to provide additional configuration for every test file, the [`setupFiles` configuration option](configuration#setupfiles-array) can be used to specify setup scripts.