which looks for a literal octothorpe # character, then captures () 1 or more digits \d+ which follow it.
The // surrounding the regular expression simply delimit the regular expression in Groovy, and the =~ says that we should look for matches to that regular expression within text. The result is assigned to mc.
So mc[0] contains the first match, which is a list of two elements: the entire matched expression #12, and the first capturing group 12.
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The only regular expression here is
which looks for a literal octothorpe
#character, then captures()1 or more digits\d+which follow it.The
//surrounding the regular expression simply delimit the regular expression in Groovy, and the=~says that we should look for matches to that regular expression withintext. The result is assigned tomc.So
mc[0]contains the first match, which is a list of two elements: the entire matched expression#12, and the first capturing group12.