Get the perl string calculation result

Question

If one string is expressed like below $str = \"5+2-1\"; I\'d like to get the calculation result from that string. How do I convert to scalar to compute this? Thanks.

Answer 1

If you are sure the string does not contain any malicious code you can use eval to treat the content of it as perl code.

#!/usr/bin/perl
use strict;
use warnings;

my $string = "5+2-1";

print eval($string);
#print 6