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Regex Tester

Test and debug regular expressions with live match highlighting.

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About Regex Tester

The Regex Tester on Zynocode Labs helps you write and debug regular expressions with live match highlighting. Enter your pattern and test string, and instantly see every match highlighted along with captured groups.

How to Use the Regex Tester

  1. 1Enter your regular expression in the pattern field (without delimiters)
  2. 2Set flags as needed (g, i, m, s)
  3. 3Type or paste your test string in the input area
  4. 4All matches are highlighted in real time with match details below

Frequently Asked Questions

Which regex flavour does this use?

JavaScript regex (ECMAScript). Most patterns are compatible with modern web and Node.js environments.

Can I test named capture groups?

Yes. Named groups ((?<name>...)) are supported and shown in the match details.

Is there a cheat sheet built in?

Yes! Toggle the regex cheat sheet panel for a quick reference of common patterns and metacharacters.