PACKthe literal text PACK (case sensitive) \[the literal [ (9110 / 1338 / 5B16)
\da Unicode decimal digit
*matches any number of characters from the set below:
\da Unicode decimal digit
.the literal . (4610 / 568 / 2E16)
\s*a Unicode whitespace character, repeated any number of times
\$the literal $ (3610 / 448 / 2416)
Negated Character Class[^][+]* *matches any number of characters outside the set below:
]the literal ] (9310 / 1358 / 5D16)
[the literal [ (9110 / 1338 / 5B16)
+the literal + (4310 / 538 / 2B16)
]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