以下代码
#!/usr/bin/perl
use strict;
use warnings;
my $s1 = 'aaa2000@yahoo.com';
my $s2 = 'aaa_2000@yahoo.com';
my $s3 = 'aaa2000';
my $s4 = 'aaa_2000';
no locale;
print "\nNO Locale:\n\n";
if ($s1 gt $s2) {print "$s1 is > $s2\n";}
if ($s1 lt $s2) {print "$s1 is < $s2\n";}
if ($s1 eq $s2) {print "$s1 is = $s2\n";}
if ($s3 gt $s4) {print "$s3 is > $s4\n";}
if ($s3 lt $s4) {print "$s3 is < $s4\n";}
if ($s3 eq $s4) {print "$s3 is = …