in reply to
making my suroutine and parts of my program case insensitive.
Change your first regex to /$_/ig. Note the i-modifier (which tells it to match case insensitively). Another option is to uc() or lc() all input data and then compare.
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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