It would seem that your regex isn't matching on subsequent passes. Since you never reset it, it won't be undef, it will be whatever it used to be. 
   @ARGV = <$responseDir/*>;
   undef $newFile; # Force reset
   while (<>)
    {
         $newFile = $ARGV, print(STDERR "Found $commonField\n"), last 
+if /^"$commonField"$/;
    }
   print "my newFile to change is $newFile\n";

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In reply to Re: Help on foreach loop by Roy Johnson
in thread Help on foreach loop by Anonymous Monk

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