\[the literal [ (9110 / 1338 / 5B16)
\s*a Unicode whitespace character, repeated any number of times
Non-Capturing Group(?:\+|(-))? ?repeats the group contents below at most once:
\+the literal + (4310 / 538 / 2B16)
-the literal - (4510 / 558 / 2D16)
\d+a Unicode decimal digit, repeated at least once
\s*a Unicode whitespace character, repeated any number of times
]the literal ] (9310 / 1358 / 5D16)
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