Hello again Anonymous Monk,

In this case you can use URI::Escape. See sample bellow:

#!/usr/bin/perl
use strict;
use warnings;
use URI::Escape;
use feature 'say';

my $str = "Character one: ω character two: ∞";
my $hex_code = uri_escape( $str );
say $hex_code;

my $string = uri_unescape( $hex_code );
say $string;

__END__

$ perl test.pl
Character%20one%3A%20%CF%89%20character%20two%3A%20%E2%88%9E
Character one: ω character two: ∞

Hope this helps, BR.