*repeats the group contents below any number of times:
\s*a Unicode whitespace character, repeated any number of times
\[the literal [ (9110 / 1338 / 5B16)
Negated Character Class[^][]+ +matches at least one character outside the set below:
]the literal ] (9310 / 1358 / 5D16)
[the literal [ (9110 / 1338 / 5B16)
]the literal ] (9310 / 1358 / 5D16)