http://so.devilmaycode.it/jquery-validate-e-mail-address-regex/ 使用新的正则表达式 增加了对地址标签(+号)的支持

function isValidEmailAddress(emailAddress) { var pattern = /^([a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+(\.[a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+)*|"((([ \t]*\r\n)?[ \t]+)?([\x01-\x08\x0b\x0c\x0e-\x1f\x7f\x21\x23-\x5b\x5d-\x7e\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|\\[\x01-\x09\x0b\x0c\x0d-\x7f\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))*(([ \t]*\r\n)?[ \t]+)?")@(([a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\d\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.)+([a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]|[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF][a-z\d\-._~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]*[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.?$/i; return pattern.test(emailAddress); };

if( !isValidEmailAddress( emailaddress ) ) { /* do stuff here (email is invalid) */ }

这是由用户Luca Filosofi提供的答案

如上所述，如果你问我的话，我觉得这个已经足够好了。

var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;

但如果你不希望域名结尾(.com， .nu， .net等)包含数字(这是我的首选)，编辑版本将是:

var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z]{2,4})+$/;

checkRegexp( email, /^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i, "eg. ui@jquery.com" );

参考:JQUERY UI网站

查看http: //bassistance.de/jquery-plugins/jquery-plugin-validation/。这是一个很好的jQuery插件，它允许为表单构建强大的验证系统。 这里有一些有用的示例。因此，表单中的电子邮件字段验证看起来是这样的:

$("#myform").validate({
  rules: {
    field: {
      required: true,
      email: true
    }
  }
});

有关详细信息和示例，请参阅电子邮件方法文档。

使用这个

if ($this.hasClass('tb-email')) {
    var email = $this.val();
    var txt = /^([a-zA-Z0-9_\.\-\+])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    if (!txt.test(email)) {
        e.preventDefault();
        $this.addClass('error');
    } else {
        $this.removeClass('error');
    }
}

<script type="text/javascript">
    $(document).ready(function() {
      $('.form_error').hide();
      $('#submit').click(function(){
           var name = $('#name').val();
           var email = $('#email').val();
           var phone = $('#phone').val();
           var message = $('#message').val();
           if(name== ''){
              $('#name').next().show();
              return false;
            }
            if(email== ''){
               $('#email').next().show();
               return false;
            }
            if(IsEmail(email)==false){
                $('#invalid_email').show();
                return false;
            }

            if(phone== ''){
                $('#phone').next().show();
                return false;
            }
            if(message== ''){
                $('#message').next().show();
                return false;
            }
            //ajax call php page
            $.post("send.php", $("#contactform").serialize(),  function(response) {
            $('#contactform').fadeOut('slow',function(){
                $('#success').html(response);
                $('#success').fadeIn('slow');
               });
             });
             return false;
          });
      });
      function IsEmail(email) {
        var regex = /^([a-zA-Z0-9_\.\-\+])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
        if(!regex.test(email)) {
           return false;
        }else{
           return true;
        }
      }
  </script>

<form action="" method="post" id="contactform">
                            <table class="contact-table">
                              <tr>
                                <td><label for="name">Name :</label></td>
                                <td class="name"> <input name="name" id="name" type="text" placeholder="Please enter your name" class="contact-input"><span class="form_error">Please enter your name</span></td>
                              </tr>
                              <tr>
                                <td><label for="email">Email :</label></td>
                                <td class="email"><input name="email" id="email" type="text" placeholder="Please enter your email" class="contact-input"><span class="form_error">Please enter your email</span>
                                  <span class="form_error" id="invalid_email">This email is not valid</span></td>
                              </tr>
                              <tr>
                                <td><label for="phone">Phone :</label></td>
                                <td class="phone"><input name="phone" id="phone" type="text" placeholder="Please enter your phone" class="contact-input"><span class="form_error">Please enter your phone</span></td>
                              </tr>
                              <tr>
                                <td><label for="message">Message :</label></td>
                                <td class="message"><textarea name="message" id="message" class="contact-input"></textarea><span class="form_error">Please enter your message</span></td>
                              </tr>
                              <tr>
                                <td></td>
                                <td>
                                  <input type="submit" class="contactform-buttons" id="submit"value="Send" />
                                  <input type="reset" class="contactform-buttons" id="" value="Clear" />
                                </td>
                              </tr>
                            </table>
     </form>
     <div id="success" style="color:red;"></div>