Free Developer Tool

Regex Tester & Debugger

Test and debug regular expressions in real time. Match highlighting, group details, common patterns, cheat sheet, replace mode, and shareable URLs.

Enter a pattern to start

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Token	Description
.	Any character (except newline)
\d	Digit [0-9]
\D	Not a digit
\w	Word character [a-zA-Z0-9_]
\W	Not a word character
\s	Whitespace
\S	Not whitespace
\b	Word boundary
^	Start of string/line
$	End of string/line
*	0 or more
+	1 or more
?	0 or 1 (optional)
{n}	Exactly n times
{n,m}	Between n and m times
[abc]	Character class
[^abc]	Negated class
(abc)	Capturing group
(?:abc)	Non-capturing group
(?=abc)	Positive lookahead
(?!abc)	Negative lookahead
(?<=abc)	Positive lookbehind
a\|b	Alternation (a or b)
\1	Backreference to group 1
(?<name>)	Named capture group

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