Javascript Mobile number Verification email address verification

Instance:

Verify your phone numberfunction Checkthis () {var txtmobile = document.getElementById ("Txtmobile"). Value;var reg =New RegExp ("(^0{0,1}1[3|4|5|6|7|8| 9][0-9]{9}$) ");if (Reg.test (Txtmobile)) {ReturnTrue }else {$.jbox.error ("You entered the wrong phone number, please re-enter!" ","Warm Tips"); document.getElementById ("Txtmobile"). Value ="";ReturnFalse }        }Verify Mailboxfunction Checkmail () {var txtmail = document.getElementById ("Txtemail"). Value;var reg =New RegExp (^ ([a-za-z0-9]+[_|\_|\]?) *[a-za-z0-9][email protected] ([a-za-z0-9]+[_|\_|\.]?) *[a-za-z0-9]+\. [A-za-z] {2,3}$ ");if (Reg.test (Txtmail)) {ReturnTRUE;                         else {                 $.jbox.error ( Span style= "color: #a31515;" > "You entered the wrong contact email, please re-enter!" ",  " warm tip ");                 document.getelementbyid ( "Txtemail"). Value  = return false;             }         }