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Regex Tester
Live regex matching, highlight, groups and replace preview, JS regex.
- Live match highlight
- Group capture view
- Replace preview
- Common regex examples
//g
Contact: alice at example.com, bob at test.org
2 matches
Match 1: alice@example.com at 9
$1: alice$2: example.com
Match 2: bob@test.org at 28
$1: bob$2: test.org
How to use Regex Tester
- Enter pattern๏ผType the regex with g/i/m flags
- Paste text๏ผPaste sample text to see live matches and groups
- Preview replace๏ผFill the replacement, preview, then copy
FAQ
Which flags and groups are supported?
Full g/i/m/s/u/y flags, $1 and $& references in replacement, each capture group highlighted separately.
Do results match my code?
Yes, it runs on the browser JS RegExp engine โ identical to frontend code; test catastrophic patterns on small samples first.
Built-in common patterns?
Yes โ phone, email, URL, IP and ID patterns built in, one click to load and tweak.