\Bnot a Unicode word boundary
#the literal # (3510 / 438 / 2316)
\w*any word character, repeated any number of times
A-Zone character from A (6510) to Z (9010) (case sensitive)
a-zone character from a (9710) to z (12210) (case sensitive)
\w*any word character, repeated any number of times
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