javascript - email validation function not working properly -

i have made function validate email using pattern. function not validating it. please , post ur answers in detail possible. thank you.

function getemail(data){     var pattern= /^([a-z][a-z0-9\.]+[a-z0-9])@([a-z][a-z0-9\-]+[a-z0-9])\.([a-z]{2,})(\.[a-z]{2,})$/;     if (data==="")          {             console.log("email-id cannot empty!");          }     else if(pattern.test(data)===false)     {         console.log("enter valid emailid");     }     else     {         var email= "<p>"+data+"</p>";         return email;     } } 

 function validation() {          var regemail = /(.+)@(.+){2,}\.(.+){2,}/;  //regex pattern email validation           //email textbox  validation          if (regemail.test($('#<textboxid>').val())) {               alert('entered email id correct');          }          else {             alert('please enter valid email address');                       }       }