$folder:FileMuxInternaldefs


$mk:./AACBaseFileLib/common.mk:  $(PROJECT_ROOT)/../FilemuxInternalDefs/inc  \

			   if ($folder =~ /$mk/i) #this match failing for the given input
				{
					  print "\nIN\n";
								  if ($folder !~ /$mk/m)
								 {
									print "CASE-SENSITIVE:$mk\n";
						
								 }
     	       }