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regular expressions 101

Extensive regex tester and debugger with highlighting for PHP, PCRE, Python and JavaScript.

Free
Web

Regex101 is a powerful, online regular expression tool with extensive support for multiple languages including PHP, PCRE, Python and JavaScript.

It features the following:

- Built-in help system with token references,
- Explanation of regular expressions to help understand them.
- Code exporter for PHP, Python and JavaScript.
- Save expressions and share them with others.
- Searchable, filterable online search for shared regular expressions. More Info »

Links to official regular expressions 101 sites

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Support for regular expressions Add a feature

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debugger javascript php python regular-expression-tester

regular expressions 101 (sometimes referred to as Regex101.com, Regex101, Regex 101) was added by piotrex in Mar 2014 and the latest update was made in Aug 2019. The list of alternatives was updated Aug 2019. It's possible to update the information on regular expressions 101 or report it as discontinued, duplicated or spam.

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