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Re: Re: Case-preserving substitutions

by jryan (Vicar)
on Jan 18, 2002 at 13:31 UTC ( #139778=note: print w/replies, xml ) Need Help??


in reply to Re: Case-preserving substitutions
in thread Case-preserving substitutions

What did you do, golf mine? :)

I was unaware at that property of ^, very nice... in fact, I'm not ever sure why that works. Time for me to hit perlman:perlop.

Update:

Ok, its like this: ^ is XOR. That means the bit returns true if and only if one of the 2 bits is true:

lc $new # lowercase the replacement ^ $1 # XOR with $1 - will increase the values by # the corresponding ascii value of each character # of $1 ^ lc $1 # XOR with lc $1 - basically, it will subract the # ascii values of lowercase $1 - if the values were # lowercase to begin with, the resulting sum is 0, # otherwise, the increase is enough to uppercase # the corresponding character
In short - an incredibly concise way of doing it. ++!

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