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Regex Tester
patterns, made visible.
Test a regular expression against sample text and inspect each match and capture group.
FREE TO USE / NO ADS / NO LOGIN REQUIRED
Test regex matches and capture groups online
Try a regular expression against your sample text before using it in code. Inspect matches and captured groups while changing the pattern or flags.
- Test JavaScript regex patterns against sample text
- Inspect every match and capture group
- Set expression flags such as g, i and m
Enter a pattern, flags and sample text, then select Test expression. The results follow the browser's JavaScript regular expression engine; patterns for other languages may behave differently.
Popular ways to use Regex Tester
- Try a pattern against sample text before using it in code.
- Inspect which parts of a match each capture group returns.
How processing and privacy work
Processing runs in your browser. The page may download scripts, fonts or processing engines to run the tool; these downloads are separate from uploading your input files.