Gentle upallnight,

jwkrahn is right that the 'g's are superfluous. But I don't think that is the core of the problem. Indeed, if that had been the problem, the match would have always failed. You are invoking s///g in a void context, not a scalar one. Indeed, after a mild cleaning of your code, I can't reproduce the problem as described:

#!/usr/local/bin/perl -w

use strict;

my @files =qw(CQA_frobbish.OUTPUT cQa_blintz.output cqA_pmos_lkg.outpu
+t);

my $ModNameList = 'pmos_lkg';
foreach my $file ( @files ) {
    if($file =~ m/.output/gi ) {
        my $name = $file;
        $name =~ s/.output//gi;
        $name =~ s/^cqa_//gi;
        if($ModNameList =~ m/$name/g) {
            print "Found:$name\n";
        }
    }
}
[download]

prints

  Found:pmos_lkg
[download]

Some other comments on your code:

• use strict; Your code will be better and you'll get more help. We don't like debugging code when it turns out that the problem is some minor spelling error. Really, this is a monastery and using strict is a religious matter around here.
• Don't have a scalar $files and an array @files. It's just confusing and a potential source of error.
• You don't need to successively trim the $name string. A pattern match out of the loop variable would give you all you need. The 'x' modifier allows us to comment the pattern match.

  use strict;
  foreach (@files){
      my $name2;
      if(($name2) =
             / ^cqa_     # Starts with cqa_
           (.*)      # Here's the namestring we want
           \.output  # and the right file extenstion
           $/xi      # and nothing else.
         and
         $ModNameList =~ /$name2/){
      print "FOUND: $name2\n"}}
  [download]

throop

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