Regular Expressions 101

^start of line

Set-Cookie:the literal text Set-Cookie: (case insensitive)

\s*any whitespace character, repeated any number of times

Group 1([^;\r\n]*)

Negated Character Class[^;\r\n]*

*matches any number of characters outside the set below:

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^Set-Cookie:\s*([^;\r\n]*)

Test String
New

HTTP/1.1 200 OK
Content-Length: 27
Content-Type: application/json; charset=utf-8
Server: Microsoft-IIS/7.5
Access-Control-Allow-Origin: http://localhost
Set-Cookie: sessionToken=22A2...DB87
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Date: Tue, 16 Feb 2016 16:28:12 GMT

Regular Expression

Test StringNew

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Test String
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