msg_id="the literal text msg_id=" (case sensitive) Character Class[0-9a-fA-F]{4} {4}matches exactly 4 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
a-fone character from a (9710) to f (10210) (case sensitive)
A-Fone character from A (6510) to F (7010) (case sensitive)
-the literal - (4510 / 558 / 2D16)
Character Class[0-9a-fA-F]{4} {4}matches exactly 4 characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
a-fone character from a (9710) to f (10210) (case sensitive)
A-Fone character from A (6510) to F (7010) (case sensitive)
"the literal " (3410 / 428 / 2216)
Non-Capturing Group(?:\s+Authentication of)? ?repeats the group contents below at most once:
\s+any whitespace character, repeated at least once
Authentication ofthe literal text Authentication of (case sensitive) \s+any whitespace character, repeated at least once
.*?any character (except for line terminators), repeated any number of times
\sany whitespace character
Uthe literal U (8510 / 1258 / 5516) (case sensitive)
uthe literal u (11710 / 1658 / 7516) (case sensitive)
serthe literal text ser (case sensitive) \sany whitespace character
\[?optionally matches the literal [ (9110 / 1338 / 5B16)
Negated Character Class[^\[\]\s]+ +matches at least one character outside the set below:
\[the literal [ (9110 / 1338 / 5B16)
\]the literal ] (9310 / 1358 / 5D16)
\sany whitespace character
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