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($txt = '123abc') =~ /(a|b|c)/;
- check for c -> fail
4. 123^abc - check for a -> succeess, $1 becomes 'a'
($txt = 'barefoot') =~ /(foo|foot)/;
- check for foot -> fail
5. bare^foot - check for foo -> success, $1 becomes 'foo'
($txt = 'arvec') =~ /(ar|ec|vec)$/
3. ar^vec - check for ar$ -> fail
- check for ec$ -> fail
- check for vec$ -> success, $1 becomes 'vec'
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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