使用正则表达式验证电子邮件 [英] validate email with regex jquery

问题描述

提及此问题:

如何设置jQuery字段的最小长度?

<form id="new_invitation" class="new_invitation" method="post" data-remote="true" action="/invitations" accept-charset="UTF-8">
<div id="invitation_form_recipients"> 
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_0"><br>
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_1"><br>
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_2"><br>
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_3"><br>
</div>
<input type="submit" value="Send invitation" name="commit">
</form>

使用jquery为字段设置最小长度的代码吗?

Code for set a minimum length for a field with jquery?

$('#new_invitation').submit(function(event) {
if ($('#invitation_form_recipients input').filter(function() {
    return $(this).val();
}).length == 0) {
    // all the fields are empty
    // show error message here

    // this blocks the form from submitting
    event.preventDefault();
}

});

我如何通过jquery验证每个字段输入都具有有效的电子邮件地址?在上面的代码中?

谢谢！

$('#new_invitation').submit(function(e)  {
 $('#invitation_form_recipients input').each(function(e) {
   email_address = $(this);
   email_regex = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/i;
   if(!email_regex.test(email_address.val())){ alert('this is not valid email'); e.preventDefault(); return false;  }
 });    
});

推荐答案

您可能希望使用正则表达式，例如

You probably want to use a regex like the one described here to check the format. When the form's submitted, run the following test on each field:

var userinput = $(this).val();
var pattern = /^\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b$/i

if(!pattern.test(userinput))
{
  alert('not a valid e-mail address');
}​

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