The reason is that $file =~ s/\s*$// is clearing the $DIGIT variables and setting its own (which happen to be undef, since they're not defined by the regex). Perhaps you want to take this approach: 
if (my ($f, $l) = $line =~ /(.+)\s*\(\)\xA1\s*(.+\.txt)/) {
  $f =~ s/\s+$//;  # notice \s+ and not \s*, too
  print OUT qq{<a href="$l">$f</a><br>\n};
}

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_____________________________________________________
Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: RegExp help by japhy
in thread RegExp help by karmas

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