Regex Tester

Live regular expression tester with match highlighting, capture groups, replace mode, and flag toggles.

Pattern

/ /

g global i case-insensitive m multiline s dotAll

Quick examples:

Email URL IPv4 Hash Groups Empty lines

Test string

Highlighted matches

Match details

Replace

Regex quick reference

Character classes

. Any char (except newline) \d Digit \w Word char \s Whitespace

[abc] a, b, or c [^abc] Not a, b, or c [a-z] Range

Anchors

^ Start of string/line $ End \b Word boundary

Quantifiers

* 0+ + 1+ ? 0 or 1 {n} Exactly n {n,m} n to m

Groups

(abc) Capture group (?:abc) Non-capturing (?<name>abc) Named

Lookaround

(?=abc) Lookahead (?!abc) Negative (?<=abc) Lookbehind