in reply to
Boolean operators in PERL regexp?
or something near that. Note that there are much better tools for parsing HTML than regular expressions. Try HTML::TokeParser or HTML::Parser, and save yourself a headache.
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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