?repeats the group contents below at most once:
.*?any character (except for line terminators), repeated any number of times
"the literal " (3410 / 428 / 2216)
(?i)applies the following effective flags to the remainder of the pattern: gmi i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
Userthe literal text User (case insensitive) -?optionally matches the literal - (4510 / 558 / 2D16)
(?i)applies the following effective flags to the remainder of the pattern: gmi i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
Agent",the literal text Agent", (case insensitive) \s+any whitespace character, repeated at least once
"value":the literal text "value": (case insensitive) \s+any whitespace character, repeated at least once
"the literal " (3410 / 428 / 2216)
Group useragent(?<useragent>[^"]*) Negated Character Class[^"]* *matches any number of characters outside the set below:
"the literal " (3410 / 428 / 2216)