docs: Clarify CLI param testPathIgnorePatterns usage (#11304)

docs/CLI.md

@@ -321,9 +321,11 @@ Note that `column` is 0-indexed while `line` is not.
 
 A regexp pattern string that is matched against all tests paths before executing the test. On Windows, you will need to use `/` as a path separator or escape `\` as `\\`.
 
-### `--testPathIgnorePatterns=[array]`
+### `--testPathIgnorePatterns=<regex>|[array]`
 
-An array of regexp pattern strings that are tested against all tests paths before executing the test. Contrary to `--testPathPattern`, it will only run those tests with a path that does not match with the provided regexp expressions.
+A single or array of regexp pattern strings that are tested against all tests paths before executing the test. Contrary to `--testPathPattern`, it will only run those tests with a path that does not match with the provided regexp expressions.
+
+To pass as an array use escaped parentheses and space delimited regexps such as `\(/node_modules/ /tests/e2e/\)`. Alternatively, you can omit parentheses by combining regexps into a single regexp like `/node_modules/|/tests/e2e/`. These two examples are equivalent.
 
 ### `--testRunner=<path>`
 

website/versioned_docs/version-25.x/CLI.md

@@ -305,9 +305,11 @@ Note that `column` is 0-indexed while `line` is not.
 
 A regexp pattern string that is matched against all tests paths before executing the test. On Windows, you will need to use `/` as a path separator or escape `\` as `\\`.
 
-### `--testPathIgnorePatterns=[array]`
+### `--testPathIgnorePatterns=<regex>|[array]`
 
-An array of regexp pattern strings that are tested against all tests paths before executing the test. Contrary to `--testPathPattern`, it will only run those tests with a path that does not match with the provided regexp expressions.
+A single or array of regexp pattern strings that are tested against all tests paths before executing the test. Contrary to `--testPathPattern`, it will only run those tests with a path that does not match with the provided regexp expressions.
+
+To pass as an array use escaped parentheses and space delimited regexps such as `\(/node_modules/ /tests/e2e/\)`. Alternatively, you can omit parentheses by combining regexps into a single regexp like `/node_modules/|/tests/e2e/`. These two examples are equivalent.
 
 ### `--testRunner=<path>`
 

website/versioned_docs/version-26.x/CLI.md

@@ -321,9 +321,11 @@ Note that `column` is 0-indexed while `line` is not.
 
 A regexp pattern string that is matched against all tests paths before executing the test. On Windows, you will need to use `/` as a path separator or escape `\` as `\\`.
 
-### `--testPathIgnorePatterns=[array]`
+### `--testPathIgnorePatterns=<regex>|[array]`
 
-An array of regexp pattern strings that are tested against all tests paths before executing the test. Contrary to `--testPathPattern`, it will only run those tests with a path that does not match with the provided regexp expressions.
+A single or array of regexp pattern strings that are tested against all tests paths before executing the test. Contrary to `--testPathPattern`, it will only run those tests with a path that does not match with the provided regexp expressions.
+
+To pass as an array use escaped parentheses and space delimited regexps such as `\(/node_modules/ /tests/e2e/\)`. Alternatively, you can omit parentheses by combining regexps into a single regexp like `/node_modules/|/tests/e2e/`. These two examples are equivalent.
 
 ### `--testRunner=<path>`