diff --git a/src/validate/formatter/EmailFormatter.js b/src/validate/formatter/EmailFormatter.js
index 0900fc2..31d200f 100644
--- a/src/validate/formatter/EmailFormatter.js
+++ b/src/validate/formatter/EmailFormatter.js
@@ -65,7 +65,14 @@ module.exports = require( './PatternFormatter' )(
// Must be a valid hostname and may contain comments in
// parenthesis. IPs are technically allowed in brackets, but
// we're not going to support that crap.
- '[a-zA-Z0-9-.()]+' +
+ // begins with a letter or a number
+ '[a-zA-Z0-9]+' +
+ // then can have any other acceptable chars
+ '[a-zA-Z0-9-]*' +
+ // and optional subdomains
+ '(?:\\.[a-zA-Z0-9-]+)*' +
+ // TLD
+ '\\.[a-zA-Z]{2,}' +
'$'
),
diff --git a/test/validate/formatter/EmailFormatterTest.js b/test/validate/formatter/EmailFormatterTest.js
new file mode 100644
index 0000000..c451f32
--- /dev/null
+++ b/test/validate/formatter/EmailFormatterTest.js
@@ -0,0 +1,63 @@
+/**
+ * @license
+ * StringFormat formatter test
+ *
+ * Copyright (C) 2010-2019 R-T Specialty, LLC.
+ *
+ * This file is part of liza.
+ *
+ * liza is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+
+var liza = require( '../../../' ),
+ Sut = liza.validate.formatter.EmailFormatter,
+ assert = require( 'assert' );
+
+
+describe( 'validate.formatter.StringFormat', function()
+{
+ // test email addresses from
+ // https://blogs.msdn.microsoft.com/testing123/2009/02/06/email-address-test-cases/
+ [
+ "email@domain.com",
+ "firstname.lastname@domain.com",
+ "email@subdomain.domain.com",
+ "firstname+lastname@domain.com",
+ 'email"@domain.com',
+ "1234567890@domain.com",
+ "email@domain-one.com",
+ "_______@domain.com",
+ "email@domain.name",
+ "email@domain.co.jp",
+ "firstname-lastname@domain.com",
+ ].forEach( email_address => assert.equal( Sut.parse( email_address ), email_address ) );
+
+ [
+ "",
+ "plainaddress",
+ "#@%^%#$@#$@#.com",
+ "@domain.com",
+ "Joe Smith ",
+ "email.domain.com",
+ // "email@domain@domain.com",
+ ".email@domain.com",
+ "email.@domain.com",
+ "email..email@domain.com",
+ "あいうえお@domain.com",
+ "email@domain.com (Joe Smith)",
+ "email@domain",
+ "email@-domain.com",
+ "email@domain..com",
+ ].forEach( email_address => assert.throws( () => Sut.parse( email_address ), Error ) );
+} );