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Binary "=~" binds a scalar expression to a pattern match.
Binary "!~" is just like "=~" ...
Unary "~" performs bitwise negation
""->"" is an infix dereference operator, just as it is in C and C++.
nonassoc < > <= >= lt gt le ge
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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