^start of line
the literal (3210 / 408 / 2016)
\(the literal ( (4010 / 508 / 2816)
Character Class[[:alpha:]]+ +matches at least one character from the set below:
[:alpha:]an alphabetic character [a-zA-Z]
\.?optionally matches the literal . (4610 / 568 / 2E16)
\)the literal ) (4110 / 518 / 2916)
$end of line
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