Regex Tester
6 toolsTest regular expressions with live match highlighting.
Runs in your browser — your files and text stay on your device
Test a regular expression against sample text and see every match and capture group highlighted. Build your pattern one piece at a time, and try edge cases before using it in code. Regex flavors differ slightly between languages, so confirm the pattern in your target environment.
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2 matches
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How to use this tool
- 1Type a pattern and flags.
- 2Paste sample text.
- 3Matches highlight live with a running count.
Frequently asked questions
What do the flags mean?
g finds all matches, i ignores case, m makes ^/$ match line boundaries, s makes . match newlines.
Is my test text sent anywhere?
No — matching runs entirely in your browser.