Common JavaScript Form validation regular (phone, mailbox, number, illegal character)

Common Web page Effects form verification Regular (phone, mailbox, number, illegal character)

function $ (obj) {
return document.getElementById (obj);
}
function Test_phone (strphone)
{
var Myreg =/(^ (0d{2,3})-(D{8}) $) | (^ (0d{3})-(D{7}) $) | (^ (0d{2})-(D{8})-(d+) $) | (^ (0d{3})-(D{7})-(d+) $) | (^ (13|15|18) d{9}$)/;
if (Myreg.test (Strphone)) return true;
return false;
}
Mailbox
function Isemail (s)
{
if (/^[0-9a-z][_.0-9a-z-]{0,31}@ ([0-9a-z][0-9a-z-]{0,30}[0-9a-z].) {1,4} [A-z] {2,4}$/.test (s)) return true;
else return false;
}
Script characters
function ISScript (s)
{
if (/^<scripts*.*>.*</script>+$/.test (s)) return false;
else if (/^<scripts*.*>+$/.test (s)) return false;
else if (/^</script>+$/.test (s)) return false;
else return true;
}
Digital
function Isnum (s)
{
if (/^[0-9]+$/.test (s)) return true;
else return false;
}
}