Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8

Function

  • Match
  • Substitution
  • List
  • Unit Tests
/
!(\.gitignore)$
/
i
! matches the character ! with index 3310 (2116 or 418) literally (case insensitive)
1st Capturing Group
(\.gitignore)
\. matches the character . with index 4610 (2E16 or 568) literally (case insensitive)
gitignore
matches the characters gitignore literally (case insensitive)
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
i

Test String