Regex Tester

Test regular expressions with live highlighting

/ /

Test String

Match Info

Enter a pattern and test string to see matches

Quick Reference

Character Classes

`.`	Any character (except newline)
`\d`	Digit [0-9]
`\D`	Not a digit
`\w`	Word char [a-zA-Z0-9_]
`\W`	Not a word char
`\s`	Whitespace
`\S`	Not 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 & Boundaries
  ^ Start of string/line
 $ End of string/line
 \b Word boundary
 \B Not a word boundary
 
 
  Groups & Lookaround
  (abc) Capture group
 (?:abc) Non-capturing group
 (?<name>abc) Named capture group
 \1 Backreference
 (?=abc) Positive lookahead
 (?!abc) Negative lookahead
 (?<=abc) Positive lookbehind
 (?<!abc) Negative lookbehind
 
 
  Flags
  g Global — find all matches
 i Case insensitive
 m Multiline (^ and $ per line)
 s Dotall (. matches newlines)
 u Unicode support

`^`	Start of string/line
`$`	End of string/line
`\b`	Word boundary
`\B`	Not a word boundary

`(abc)`	Capture group
`(?:abc)`	Non-capturing group
`(?<name>abc)`	Named capture group
`\1`	Backreference
`(?=abc)`	Positive lookahead
`(?!abc)`	Negative lookahead
`(?<=abc)`	Positive lookbehind
`(?<!abc)`	Negative lookbehind

`g`	Global — find all matches
`i`	Case insensitive
`m`	Multiline (^ and $ per line)
`s`	Dotall (. matches newlines)
`u`	Unicode support