Regex Tester

Live matching · flag toggles · named groups · pattern library — runs locally, nothing is sent to a server.

Regular expression

Syntax reference

Flags g global i ignore case m multiline s dotAll u unicode y sticky /…/g

Test string

0matches

0capture groups

Result (matches highlighted)

Enter a pattern to see matches…

📚 Common patterns & cheatsheet — click a pattern to try it

Token	Meaning	Token	Meaning
`.`	any character except line break	`\d \w \s`	digit · word char · whitespace
`\D \W \S`	NOT digit · word · whitespace	`\b`	word boundary
`^ $`	start · end of text (of line with m)	`[abc] [^abc]`	one of · none of
`[a-z0-9]`	range	`a\|b`	a or b
`* + ?`	0+ · 1+ · 0 or 1	`{3} {2,5} {2,}`	exactly · between · at least
`*? +?`	lazy (as few as possible)	`(…)`	capture group
`(?:…)`	group without capturing	`(?<name>…)`	named group
`\1 \k<name>`	back-reference	`(?=…) (?!…)`	lookahead · negative lookahead
`(?<=…) (?<!…)`	lookbehind · negative lookbehind	`\p{L} \p{N}`	any letter · number (needs u)
`\. \* \\`	escape a special character	`\n \t`	line break · tab