@importthe literal text @import (case insensitive) \s*any whitespace character, repeated any number of times
?repeats the group contents below at most once:
urlthe literal text url (case insensitive) \s*any whitespace character, repeated any number of times
\(?optionally matches the literal ( (4010 / 508 / 2816)
Negated Character Class[^;]+? +?matches at least one character outside the set below:
;the literal ; (5910 / 738 / 3B16)
\)?optionally matches the literal ) (4110 / 518 / 2916)
;the literal ; (5910 / 738 / 3B16)
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
g modifier: global. Finds all matches instead of stopping after the first