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This is a little crufty, I'll admit, but I like it!
sub splitter { local $_ = shift; split /(?<!^)(?!(??{ quotemeta substr($_, $-[0]-1, 1) }))/; }
This splits a string at all locations that 1) are not the beginning of the string, and 2) are not followed by the character immediately preceding this location.

Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

In reply to Re: Elegant way to split into sequences of identical chars? by japhy
in thread Elegant way to split into sequences of identical chars? by pKai

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