So much of your code can be simplified by changing
while ($str =~ /([A-Z,0-9])/ig) {
to
while ($str =~ /(([A-Z,0-9])\2*)/ig) {

The posted code is beyond not elegant. It's in the realm of needless complexity.

Update: Forgot to mention:

Besides that, I don't know why you imposed a limit on which characters can be processed. The OP didn't mention anything about ignoring characters which are neither unaccented latin alpha, romanlatin? digits nor a comma. (Did you even mean to put that comma there?)

In reply to Re^2: Regex question by ikegami
in thread Regex question by Anonymous Monk

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