sthe literal s (11510 / 1638 / 7316) (case insensitive)
Sthe literal S (8310 / 1238 / 5316) (case insensitive)
ectionthe literal text ection (case insensitive) \s*any whitespace character, repeated any number of times
\(?optionally matches the literal ( (4010 / 508 / 2816)
\d+a digit, repeated at least once
Non-Capturing Group(?:\.\d+)? ?repeats the group contents below at most once:
\.the literal . (4610 / 568 / 2E16)
\d+a digit, repeated at least once
\)?optionally matches the literal ) (4110 / 518 / 2916)
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
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters