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
  • Java 8

Function

  • Match
  • Substitution
  • List
  • Unit Tests
/
(..).(..).
/
m
1st Capturing Group
(..)
. matches any character (except for line terminators)
. matches any character (except for line terminators)
. matches any character (except for line terminators)
2nd Capturing Group
(..)
. matches any character (except for line terminators)
. matches any character (except for line terminators)
. matches any character (except for line terminators)
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
m

Test String

Substitution

Processing...