String::Validator::Email - String::Validator for checking Email Addresses.


version 2.01


String::Validator::Email is part of the String Validator Collection. It will check a string against any number of email validation rules, and optionally against a second string (as in a confirmation box on a webform).


String::Validator::Email - Check if a string is an email address.

String::Validator Methods and Usage

Provides and conforms to all of the standard String::Validator methods, please see String::Validator for general documentation, and String::Validator::Common for information on the base String::Validator Class.

Methods Specific to String::Validator::Email

Parameters to New with (default) behaviour.

 mxcheck     (OFF) : Perform MX Lookup for Domain Given.
 tldcheck    (ON ) : Validate TLD against a List.
 fqdn        (ON ) : Require a Fully Qualified Domain Name.
 allow_ip    (OFF) : Allow @[ip] (forces tld & fqdn off.)
 min_len     (OFF)
 max_len     (OFF)

Important notes -- SVE uses Email::Valid, however, tldcheck is defaulted to on. The choice to turn tldcheck should be obvious. The fudge and local_rules options are specific to aol and compuserve, and are not supported. Finally mxcheck is not tried if there is already an error, since Email::Valid's DNS check does not work, that is performed directly through Net::DNS.


Email::Valid provides very terse errors, Expound provides errors more appropriate for returning to an end user.


 use String::Validator::Email ;
 my $Validator = String::Validator::Email->new() ;
 if ( $Validator->Is_Valid( '' ) { say "good" }
 if ( $Validator->IsNot_Valid( 'bad@address=com') { say $Validator->Errstr() }


John Karr, <brainbuz at>


Please report any bugs or feature requests to bug-string-validator-email at, or through the web interface at I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


You can find documentation for this module with the perldoc command.

    perldoc String::Validator::Email

Bug Reports and Patches

Please submit Bug Reports and Patches via



Copyright 2018, 2012 John Karr.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 3 or at your option any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

A copy of the GNU General Public License is available in the source tree; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.


John Karr <>


This software is Copyright (c) 2018 by John Karr.

This is free software, licensed under:

  The GNU General Public License, Version 3, June 2007