:the literal : (5810 / 728 / 3A16)
.*?any character (except for line terminators), repeated any number of times
\[the literal [ (9110 / 1338 / 5B16)
*matches any number of characters from the set below:
0-9one character from 0 (4810) to 9 (5710)
\]the literal ] (9310 / 1358 / 5D16)
:the literal : (5810 / 728 / 3A16)