Regex Tester

Test JavaScript regular expressions with live highlighting, match details, and replace mode. Results update as you type.

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Test string

Matches

Character classes

. Any character (except newline)

\d Digit [0-9]

\D Non-digit

\w Word char [a-zA-Z0-9_]

\W Non-word char

\s Whitespace

\S Non-whitespace

[abc] Any of a, b, or c

[^abc] Not a, b, or c

[a-z] Range a to z

Quantifiers

* 0 or more

+ 1 or more

? 0 or 1

{n} Exactly n

{n,} n or more

{n,m} Between n and m

*? Lazy (minimal match)

Anchors

^ Start of string/line

$ End of string/line

\b Word boundary

\B Non-word boundary

Groups & lookaround

(abc) Capture group

(?:abc) Non-capture group

(?<name>abc) Named group

a|b Alternation (a or b)

(?=abc) Positive lookahead

(?!abc) Negative lookahead

(?<=abc) Positive lookbehind

(?<!abc) Negative lookbehind

Escapes

\. Literal dot

\\ Literal backslash

\n Newline

\t Tab

Regular Expression Tester