Regex tester

JavaScript regular expressions, tested live in your browser. Nothing is sent.

Pattern

//

Test text

Matches

Capture groups

Replace

Replacement ($1, $&, $<name> work)

Cheat sheet

`.`	any character (not newline unless `s`)	`\d \w \s`	digit, word char, whitespace (capital = opposite)
`^ $`	start / end of input (line with `m`)	`\b`	word boundary
`[abc] [^abc]`	one of / none of	`[a-z]`	range
`* + ?`	0+, 1+, 0 or 1 (add `?` for lazy)	`{2,4}`	between 2 and 4 times
`(x)`	capture group	`(?:x)`	non-capturing group
`(?<n>x)`	named group	`a\|b`	a or b
`(?=x) (?!x)`	lookahead, negative	`(?<=x) (?<!x)`	lookbehind, negative
`\1 \k<n>`	backreference	`\. \\ \/`	escape a special character