email validation in javascript using regular expression

1function validateEmail (emailAdress)
2{
3  let regexEmail = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
4  if (emailAdress.match(regexEmail)) {
5    return true; 
6  } else {
7    return false; 
8  }
9}
10
11let emailAdress = "test@gmail.com";
12console.log(validateEmail(emailAdress));
13

1function validateEmail(email) {
2    var re = /^(([^<>()\[\]\\.,;:\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,}))$/;
3    return re.test(String(email).toLowerCase());
4}
5

1/* JavaScript: validating email address */
2
3isValidEmail("xyz@abc.com"); // true
4
5function isValidEmail(email) {
6	var emailRegex = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
7	return !!email && typeof email === 'string'
8		&& email.match(emailformat)};
9};

1//99.99% Matching..
2let emailRegEx = /[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/;

1function validateEmail(email) 
2    {
3        var re = /\S+@\S+\.\S+/;
4        return re.test(email);
5    }
6    
7console.log(validateEmail('anystring@anystring.anystring'));

1var emailReg =  /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
2if(!emailReg.test($('#inputUsername').val()) ){
3  alert('Enter valid email');
4  return false;			
5}