in reply to
The following could be a start:
$data =~ /^Subject.*\*\*(.*?)\*/;
A better way to do this is [docs://perlre] which produces a link, perlre, (to the perlre page http://perldoc.perl.org/) and the current docs.
Though, I suppose, if directing one's suggestions to someone who hasn't updated/upgraded his or her installed Perl since 1999, the Monastery docs might be more appropriate.
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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