Free Online Regex Tester – Test, Debug & Replace Regular Expressions Live

Regex Tester

Test regular expressions live, see matches and capture groups, and run find & replace • 100% free • No upload to server

Regular expression / /

Flags

Global – find all matches g Ignore case i Multiline – ^ and $ per line m Dot matches newline s Unicode mode u

Common patterns

Choose a ready-made pattern… Email address Web URL Phone number Date (YYYY-MM-DD) with groups Hex color IPv4 address Numbers (integers and decimals) Capitalized words Hashtags

Test text 0 characters

Highlighted matches

Match details

Replace with (use $1, $2 for groups, $& for the whole match)

Replaced result

Quick regex reference

. any character

\d digit • \D non-digit

\w word char • \W non-word

\s space • \S non-space

^ start • $ end

\b word boundary

* 0 or more • + 1 or more

? optional • {2,4} 2 to 4 times

[abc] any of a, b, c

[^abc] none of a, b, c

(x) capture group

(?:x) non-capturing group

a|b a or b

(?=x) lookahead

All processing happens in your browser. Your text never leaves your device.