mockstack.

Regex Tester

0 MATCHES ← Developer & Data

Matches highlight as you type, with a cheat sheet to learn from.

Pattern / /

Flags

Mode

Presets:

Test text

Matches

EXPLAIN

Regex cheat sheet

Click any pattern to add it to the box above.

Characters

: any character except a newlinea.c matches abc
: a digit, 0 to 9\d\d matches 42
: anything that is not a digit
: letter, digit or underscore\w+ matches hello_1
: anything that is not a word character
: whitespace: space, tab, newline
: anything that is not whitespace
: a literal dotescape any special character

Anchors and boundaries

: start of the string, or of a line with the m flag
: end of the string, or of a line with the m flag
: a word boundary\bcat\b will not match concatenate
: not a word boundary

How many

: zero or moreab*c matches ac and abbbc
: one or moreab+c matches abc, not ac
: zero or one, optionalcolou?r matches both spellings
: exactly three\d{3} matches 123
: two or more
: between two and four
: lazy: as few as possible<.+?> stops at the first >

Sets and groups

: any one of a, b or c
: anything except a, b or c
: a range
: a capture group(\d+)-(\d+) captures both numbers
: group without capturinguse when you only need the grouping
: a named capture groupread it back as groups.year
: a or bcat|dog
: whatever group 1 matched(\w+) \1 finds a doubled word

Looking around

: followed by\d+(?= dollars)
: not followed by\d+(?! dollars)
: preceded by(?<=£)\d+
: not preceded by

Flavor note

Flags

: find every match, not just the first
: ignore case
: make ^ and $ match at line breaks
: let . match newlines too
: treat the pattern as Unicodeneeded for \p{...} and emoji

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