Email Validation Regular Expression

script.js

 // ^([0-9a-zA-Z\._])+@([a-zA-Z0-9])+\.([0-9A-Za-z]){2,4}([\.a-zA-Z0-9]){0,3}+$


// example : (jQuery) Javascript

 function validateEmail(email){
   var pattren = new RegExp("^([0-9a-zA-Z\._])+@([a-zA-Z0-9])+\.([0-9A-Za-z]){2,4}([\.a-zA-Z0-9]){0,3}+$");
   if(pttren.test(email)){
     return true;
   } else 
     return false;
 }
 
 jQuery(function(){
    $("yourform").submit(function(){
      var email = $("emailField").val();
      if(!validateEmail(email)){
        e.preventDefault();
        alert("Please Enter a valid email");
      }
      }
    });
 });