\[the literal [ (9110 / 1338 / 5B16)
\d{1,4}a digit, repeated between 1 and 4 times
\]the literal ] (9310 / 1358 / 5D16)
\[the literal [ (9110 / 1338 / 5B16)
Character Class[a-zA-Z ]+ +matches at least one character from the set below:
a-zone character from a (9710) to z (12210) (case insensitive)
A-Zone character from A (6510) to Z (9010) (case insensitive)
the literal (3210 / 408 / 2016)
\]the literal ] (9310 / 1358 / 5D16)
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
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