Javascript Regex表单验证返回错误

Question

I have been trying to validate my form email input with these line of codes.

 function validate() { var emailFirst = document.getElementById('email1'); var emailFirstRGex = /^(([^<>()[\\]\\\\.,;:\\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,}))$/; var emailFirstTest = emailFirstRGex.test(emailFirst); if (emailFirstTest === false) { alert('hello20'); } } 

My form

 <form class="needs-validation" novalidate method="POST" action="nomination2.php" onsubmit="validate()"> 

I keep getting the hello20 response. Meanwhile i have tried this regex against emails on the console without error. How do I solve this?

Answer 1

emailFirstTest is declared inside your function, so checking for it outside the function means it is out of scope and doesn't exist.

Just define it above your function:

var emailFirstTest  = '';

function validate() {
  emailFirst = document.getElementById('email1');
  var emailFirstRGex = /^(([^<>()[\]\\.,;:\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,}))$/;
  var emailFirstTest = emailFirstRGex.test(emailFirst);
}