#the foreach style sets a variable, in this case $num, to 
#each element of your array. If you did not specify a
#variable, then the special variable $_ would be set 
#each time through.

foreach my $num (@number){
   if($num =~ /9432$/){
      print "match found";
   }else{
      print "match failed";
   }
}

#a C-style for loop in which case you will be using
#the $i variable to count from 0 to the end of your array 
#based on how big it is which we now know is scalar @number.

for(my $i=0 ; $i < scalar @number ; $i++){
   if($number[$i] =~ /9432$/){
      print "match found";
   }else{
      print "match failed";
   }
}