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Regex Tester
Test and debug regular expressions with live match highlighting.
Tool Panel
Processed locallyAbout Regex Tester
Highlights matches and capture groups live, with the position of each hit. The pattern and the text stay in your browser.
- 1
Supports the g, i and m flags, applied the moment you toggle them.
- 2
Lists matches in order and reports the position of each one.
- 3
Pattern and text are processed in the browser only.
- 1
Enter a pattern and text
The pattern goes on top, the test text below; an invalid pattern reports a syntax error.
- 2
Switch the flags on
Global, case-insensitive and multiline all recompute immediately.
- 3
Read matches and positions
Each match is listed with its position, which is what you need to locate it in the source.
Yes — group contents are listed alongside the full match.
Backtracking regexes can blow up with nested quantifiers. Test on a smaller input before running a pattern over a large document.
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