#!/usr/bin/perl

use strict;
use warnings;

my $problem = '1 / 2 = ';
my ($number1, $number2, $operator);

if ($problem =~ /(\d+)\s*([-+*\/])\s*(\d+)/){
  ($number1, $number2, $operator) = ($1, $2, $3);
  print "$number1 $number2 $operator\n";
}
else{
  print "regex failed\n";
}