Regular Expressions 101

Group utm_campaign(?P<utm_campaign>(?<=utm_campaign=).*?(?=&|\\s|$))

Positive Lookbehind(?<=utm_campaign=)

utm_campaign=the literal text utm_campaign= (case sensitive)

.*?any Unicode character (except for line terminators), repeated any number of times

Positive Lookahead(?=&|\\s|$)

1st Alternative&

&the literal & (38₁₀ / 46₈ / 26₁₆)

2nd Alternative\\s

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

3rd Alternative$

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?P<utm_campaign>(?<=utm_campaign=).*?(?=&|\\s|$))

Test String
New

https://www.rover.com/search/?utm_medium=email&utm_source=Responsys&utm_campaign=111017190001&utm_content=2017_11_09_O_TGiving_NoSt_SDTest_NoCoup_2&utm_term=111017

Regular Expression

Test StringNew

ExtractionProcessing...

Test String
New

Extraction
Processing...