#!/usr/bin/perl -w
#< regex-email.pl - 20121231
use strict;
use warnings;

my @examples = ( "pete\@freeflightsim.org",
    "flightgear\@sablonier.ch",
    "my.big-name.sucks-big-time\@mail.server-farm.long-domain.coop",
    "HB-GRAL <flightgear\@sablonier.ch>" );

my ($email,$name,$dom,$ext);

sub prt($) { print shift; }

# ****************************************************
# This seems the BEST for long,beatly email items ;=))
# ====================================================
sub is_email($$$$) {
    my ($txt,$rn,$rd,$re) = @_;
    if ($txt =~ /^(\w[\w\.\-]*\w)\@(\w[\w\.\-]*\w)(\.\w{2,4})$/) {
        ${$rn} = $1;
        ${$rd} = $2;
        ${$re} = $3;
        return 1;
    }
    return 0;
}
# =====================================================
# *****************************************************
sub is_email_address($$$$$) {
    my ($txt,$rb,$rn,$rd,$re) = @_;
    my $email = $txt;
    my $bgn = '';
    if ($txt =~ /^\s*(.*)\s*<(.+)>.*$/) {
        $bgn   = $1;
        $email = $2;
        $bgn = substr($bgn,0,length($bgn) - 1) while ($bgn =~ /\s$/g); # remove all TRAILING space
    }
    ${$rb} = $bgn;
    return is_email($email,$rn,$rd,$re);
}



sub is_email2($$$$) {
    my ($txt,$rn,$rd,$re) = @_;
    if ($txt =~ /^(\w+)\@([\da-zA-Z\-]{1,}\.){1,}([\da-zA-Z-]{2,6})$/ ) {
        ${$rn} = $1;
        ${$rd} = $2;
        ${$re} = $3;
        return 1;
    }
    return 0;
}

foreach my $test (@examples) {
    my $email = $test;
    if ($test =~ /^.*<(.+)>.*$/) {
        $email = $1;
    }
    my $cnt = 0;
    my $bgn = '';
    #                1      2          3
    if ($email =~ /^(\w+)\@(\w+)\.(\w{2,4})$/) {
        $name = $1;
        $dom = $2;
        $ext = $3;
        prt("Yeah!  $name\@$dom.$ext\n");
        $cnt++;
    } else {
        prt("FAILED\n");
    }
    if (is_email($email,\$name,\$dom,\$ext)) {
        prt("Yes1!  $name\@$dom"."$ext\n");
        $cnt++;
    } else {
        prt("No!\n");
    }
    if (is_email2($email,\$name,\$dom,\$ext)) {
        prt("Yes2!  $name\@$dom"."$ext\n");
        $cnt++;
    } else {
        prt("No2!\n");
    }
    if (is_email_address($test,\$bgn,\$name,\$dom,\$ext)) {
        prt("Yes3!  $name\@$dom"."$ext [$bgn]\n");
        $cnt++;
    } else {
        prt("No3!\n");
    }
    prt("email: $email passes $cnt\n\n");
}
    
# eof