I have coded not empty on fields. how do i check that email is valid or either mobile number is valid one that too us phone number.
if(mob_or_email==""){
document.getElementById('busp_email').innerHTML="Mobile/Email required";
$("#busp_email").removeClass('field_validation_error hidden');
$("#busp_email").addClass('field_validation_error');
$("#busi_name").css("color","#f42156");
}
if($('#login_password').val()==""){
document.getElementById('logp_pwd').innerHTML="Password required";
$("#logp_pwd").removeClass('field_validation_error hidden');
$("#logp_pwd").addClass('field_validation_error');
$("#log_pwd").css("color","#f42156");
}