How to validate mobile number, email in jquery

Below is the jquery mobile, Email validation regular expression, mobile validation jquery regular expression which is for checking 10 digit number and first number should not be 0 and email validation jquery regular expressional which for checking global email format.

var mob = /^[1-9]{1}[0-9]{9}$/;

var eml = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

if (eml.test($.trim($("#<%=txtEmail.ClientID %>").val())) == false) {

    alert("Please enter valid email address.");

    $("#<%=txtEmail.ClientID %>").focus();

    return false;

 }

if (mob.test($.trim($("#<%=txtMob.ClientID %>").val())) == false) {

    alert("Please enter valid mobile number.");

    $("#<%=txtMob.ClientID %>").focus();

    return false;

}