Regex Tester

Quick reference

.

any character except a line break

\d \w \s

digit, word character, whitespace

\D \W \S

not a digit, word character, whitespace

[abc] [^abc]

any of / none of a, b, c

a* a+ a?

0 or more, 1 or more, 0 or 1

a{2,5}

between 2 and 5 times

a+?

lazy: as few as possible

^ $

start / end of string (or line with m)

\b

word boundary

(abc)

capture group, used as $1

(?<name>abc)

named group, used as $<name>

(?:abc)

group without capturing

a|b

a or b

(?=a) (?!a)

followed by / not followed by a

(?<=a) (?<!a)

preceded by / not preceded by a

This tester uses your browser's JavaScript regex engine, the same one used by Node.js. Read the full guide for worked examples.