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
/
Set-Cookie:((?: [^=\n](?:=[^;\n])?)*)
/
gm
Set-Cookie: matches the characters Set-Cookie: literally (case sensitive)
1st Capturing Group
((?: [^=\n](?:=[^;\n])?)*)
Non-capturing group
(?: [^=\n](?:=[^;\n])?)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character literally (case sensitive)
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character not present in the list below
[^=\n]
+ matches the previous token between one 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)
Non-capturing group
(?:=[^;\n])?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
= matches the character = literally (case sensitive)
Match a single character not present in the list below
[^;\n]
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)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String