javascript mail validation (check)

var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (!filter.test(txtEmail.value)) {
alert(‘Please provide a valid email address’);
txtEmail.focus();
return false;
}
use this javascript function to validate email addresses.
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