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# Using Regular Expressions

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

Regular Expression or Regex are patterns that provide a means to specify and recognize texts. Some
action steps support using Regex in their configuration.

RPA Builder uses C# flavor for Regex and includes the Regex Tester tool, which enables you to
[test regular expressions](https://docs.mulesoft.com/rpa-builder/6.6/advanced-concepts-using-regular-expressions-testing-regular-expression).

For specific use cases and examples, see
[Regex Examples](https://docs.mulesoft.com/rpa-builder/6.6/advanced-concepts-using-regular-expressions-examples).

If you need further information and references, following are some links to get you started with
Regex:

- Wikipedia on regular expressions:  
  [https://en.wikipedia.org/wiki/Regular\_expression](https://en.wikipedia.org/wiki/Regular_expression)

- Regex tutorials, examples, and references:  
  [https://www.regular-expressions.info/](https://www.regular-expressions.info/)

- External Regex tester tool:  
  [http://regexstorm.net/tester](http://regexstorm.net/tester)