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my $pattern = "(?<!st)abc"; # 'st' in lookbehind
qr/$pattern/i; # error: 'Variable length lookbehind not imple
+mented in regex...
my $pattern = "(?<!sz)abc"; # 'sz' in lookbehind
qr/$pattern/i; # this works fine
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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