Text & Dev Tools
Regex Tester & Explainer
Test regular expressions with live match highlighting, capture group breakdown, and plain-English explanations.
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Quick Reference Cheat Sheet
Anchors
^ Start of string$ End of string\b Word boundary\B Non-word boundaryQuantifiers
* 0 or more+ 1 or more? 0 or 1{n} Exactly n{n,m} Between n and mCharacter Classes
. Any character\d Digit [0-9]\w Word char [a-zA-Z0-9_]\s Whitespace[abc] Character set[^abc] Negated setGroups
(abc) Capture group(?:abc) Non-capture group(?<name>abc) Named groupa|b AlternationLookaround
(?=abc) Lookahead(?!abc) Neg. lookahead(?<=abc) Lookbehind(?<!abc) Neg. lookbehindFlags
g Global (all matches)i Case-insensitivem Multiline (^ $ per line)s Dotall (. matches \n)
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Frequently Asked Questions
Is this regex tester free?
Yes, completely free with no signup or account required.
Which regex flavor does this tool use?
It uses JavaScript's built-in RegExp engine, which supports most common regex syntax including lookaheads, lookbehinds, named groups, and Unicode properties.
Is my data sent to a server?
No. All regex matching happens entirely in your browser. Your patterns and test strings never leave your device.