Regular Expressions 101

@regex101
Donate
Sponsor
Contact
Bug Reports & Feedback
Wiki
Whats new?

Save & Share

  • Save Regex
    ctrl+s
  • Update Regex
    ctrl+⇧+s

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python 2.7
  • Golang (RE2)

Function

  • Match
  • Substitution
  • List
  • Unit Tests
/
(?<=[\w ]\()[^;\n]*(?=\))
/
gmx
Positive Lookbehind
(?<=[\w ]\()
Assert that the Regex below matches
Match a single character present in the list below
[\w ]
\w matches any word character (equal to [a-zA-Z0-9_])
matches the character literally (case sensitive)
\( matches the character ( literally (case sensitive)
Match a single character not present in the list below
[^;\n]*
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
; matches the character ; literally (case sensitive)
\n matches a line-feed (newline) character (ASCII 10)
Positive Lookahead
(?=\))
Assert that the Regex below matches
\) matches the character ) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
x modifier: extended. Spaces and text after a # in the pattern are ignored
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmx

Test String