^start of line
Non-Capturing Group(?:::f{4,6}:)? ?repeats the group contents below at most once:
f{4,6}the literal f (10210 / 1468 / 6616) (case sensitive), repeated between 4 and 6 times
:the literal : (5810 / 728 / 3A16)
\S+any character that is not Unicode whitespace, repeated at least once
the literal (3210 / 408 / 2016)
.*any Unicode character (except for line terminators), repeated any number of times
the literal (3210 / 408 / 2016)
\"the literal " (3410 / 428 / 2216)
GETthe literal text GET (case sensitive) POSTthe literal text POST (case sensitive) the literal (3210 / 408 / 2016)
Negated Character Class[^\"]+ +matches at least one character outside the set below:
\"the literal " (3410 / 428 / 2216)
\"the literal " (3410 / 428 / 2216)
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
g modifier: global. Finds all matches instead of stopping after the first