Developer & Tech
Regular Expression Tester
Test patterns, flags and matches against sample text as you type.
Regex tester
See every match while you tune a pattern
0 matches
Common questions
Good to know
Which regex flavor is supported?+
The tester uses the JavaScript regular expression engine available in your browser.
Why does a pattern work elsewhere but fail here?+
Regex syntax and supported features differ between JavaScript, PCRE, Python, Java and other engines.
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View all developer & tech toolsPrivacy and quick tips +
This tool runs in your browser. Your input is not stored or sent to us.
- Start with the smallest pattern that works.
- Test multiline and Unicode input explicitly.
- Do not use a client-side regex as your only security control.