bootstrapvalidator/src/js/validator/emailAddress.js

(function($) {
    $.fn.bootstrapValidator.i18n.emailAddress = $.extend($.fn.bootstrapValidator.i18n.emailAddress || {}, {
        'default': 'Please enter a valid email address'
    });

    $.fn.bootstrapValidator.validators.emailAddress = {
        enableByHtml5: function($field) {
            return ('email' === $field.attr('type'));
        },

        /**
         * Return true if and only if the input value is a valid email address
         *
         * @param {BootstrapValidator} validator Validate plugin instance
         * @param {jQuery} $field Field element
         * @param {Object} [options]
         * @returns {Boolean}
         */
        validate: function(validator, $field, options) {
            var value = $field.val();
            if (value === '') {
                return true;
            }

            // Email address regular expression
            // http://stackoverflow.com/questions/46155/validate-email-address-in-javascript
            var emailRegExp = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
            return emailRegExp.test(value);
        }
    };
}(window.jQuery));