array1 = {this1 this2 this11 this21 this23};
array2 = {h2this1 h3this2 h5this21 h6this23 h8this13}


##</code><code>##

for $i(0.. $#array1){
 for $j(0.. $#array2){
  if($array2[$j]=~ /$array1[$i]/){
    print"$array1[$j] belongs to $array2[$i]";
   last;
}}}


##</code><code>##

this1 belongs to h2this1 
this2 belongs to h3this2 
this2 belongs to h5this21 
this2 belongs to h6this23 
this1 belongs to h8this13

##</code><code>##

this1 belongs to h2this1 
this2 belongs to h3this2 
this21 belongs to h5this21 
this23 belongs to h6this23 
this1 belongs to h8this13