^start of string
\[the literal [ (9110 / 1338 / 5B16)
Negated Character Class[^][]* *matches any number of characters outside the set below:
]the literal ] (9310 / 1358 / 5D16)
[the literal [ (9110 / 1338 / 5B16)
]the literal ] (9310 / 1358 / 5D16)
\s*a Unicode whitespace character, repeated any number of times
Negated Character Class[^:]* *matches any number of characters outside the set below:
:the literal : (5810 / 728 / 3A16)
:the literal : (5810 / 728 / 3A16)
\s*a Unicode whitespace character, repeated any number of times
.+any Unicode character (except for line terminators), repeated at least once