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Regex Tester

Type a pattern, choose flags, paste your test text, and see matches, groups & replacements instantly. Everything runs locally in your browser.

Pattern & Flags

Pattern

Quick examples

g (global) i (ignore case) m (multiline ^$) s (dotAll) u (Unicode) d (indices) y (sticky)

Tip: Use (?<name>...) for named groups. Unicode properties like \p{L} need u.

Test Text

Highlight matches

Replace

Replacement (supports $& $1 $<name> $$ $` $')

Cheatsheet & quick hints

Anchors: ^ start, $ end, \b word, \B non-word. • Quantifiers: * + ? {m,n} ? (lazy) • Character classes: ., \d \w \s, [^...] • Groups: (...) capture, (?:...) non-capture, (?<name>...) named • Lookarounds: (?=) (?!) (?<=) (?<!) • Flags: g global, i ignore case, m multiline, s dotAll, u unicode, y sticky, d indices.

Results

Ready.

0 matches

Engine: JavaScript RegExp (ECMAScript)

Matches & Groups

#	Match	Index	Length	Groups

Pattern Breakdown

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Share & persistence

Your state auto-saves to localStorage. “Share” writes everything to the URL (hash). Opening such a URL restores the pattern, flags, text & replacement — no server involved.