In such case, you have to know where the end is to determine, where the last `_' is...

I'll assume that the filename ends with .pdf:

if ($filename =~ /^(.*)_(.*)\.pdf$/) {
    # do something with $1 and $2 here
}

[download]

Because of the Perl "longest-first" matching, the underscore will match the last underscore in the filename.

In reply to Re^3: Pattern Matching in Arrays by przemo
in thread Pattern Matching in Arrays by aj.kohler

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