Regex Tester

Write and test regular expressions with live match highlighting, group capture, and replace.

Pattern

/ /

Test String

Replace

Replace output

Matches 0

Enter a pattern and test string to see matches.

Stats

0 Matches

0 Groups

0 Unique

0 Chars matched

Active flags

No flags active.

Quick Reference ▸

Character classes

.Any character (except newline)

\wWord character [a-zA-Z0-9_]

\dDigit [0-9]

\sWhitespace

\WNon-word character

\DNon-digit

\SNon-whitespace

[abc]Any of a, b or c

[^abc]Not a, b or c

[a-z]Range a–z

Anchors

^Start of string / line

$End of string / line

\bWord boundary

\BNon-word boundary

Quantifiers

*0 or more (greedy)

+1 or more (greedy)

?0 or 1 (optional)

{3}Exactly 3

{2,5}2 to 5

*?0 or more (lazy)

+?1 or more (lazy)

Groups

(abc)Capture group

(?:abc)Non-capture group

(?<n>)Named group

a|ba or b (alternation)

Lookaround

(?=)Lookahead

(?!)Negative lookahead

(?<=)Lookbehind

(?<!)Negative lookbehind

Replace tokens

$1Group 1 value

$&Entire match

$`Before match

$'After match