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  1. or download this
    AABCBAABCCCCAB
AABABAABABABAB
AAB BAAB    AB  ## I don't care what's in string 2 where there is a C 
+in string 1.
  2. or download this
    $ab  = "AABABAABABABAB";;

...
$abnomatch = "ABBABAABABABAB";;
print +(( $abc & $abnomatch ) eq $abmatch) ? 'yes' : 'no';;
no