Regular Expressions 101

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/
(country=).*?(;|$)
/
i
1st Capturing Group
(country=)
country=
matches the characters country= literally (case insensitive)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
2nd Capturing Group
(;|$)
1st Alternative
;
; matches the character ; with index 5910 (3B16 or 738) literally (case insensitive)
2nd Alternative
$
$ 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