I believe you can envelope a piece of regex of interest inside parentheses, e.g. "m/.|($ )/gcx", and ask if $1 is defined.
Also I believe this can help: m/.|$ (?{ $matched = 1; })/gcx

In reply to Re: perl indication of end of string already matched by rsFalse
in thread perl indication of end of string already matched by nachumk

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