JS Common validation function [check password. Check normal phone]

The following is our common JS check function, it has telephone verification, password verification, user name, cell phone authentication, IP authentication, and so on.

The checksum is all made up of numbers
function IsDigit (s)
{
var patrn=/^[0-9]{1,20}$/;
if (!patrn.exec (s)) return false
return True
}

Verify Login Name: Can only enter 5-20 letters beginning with a letter, can be with numbers, "_", "." The string
function Isregisterusername (s)
{
var patrn=/^[a-za-z]{1} ([a-za-z0-9]|[. _]) {4,19}$/;
if (!patrn.exec (s)) return false
return True
}

Verify user name: You can enter only 1-30 strings that start with a letter
function Istruename (s)
{
var patrn=/^[a-za-z]{1,30}$/;
if (!patrn.exec (s)) return false
return True
}

Verify password: Can only enter 6-20 letters, numbers, underscores
function ispasswd (s)
{
var patrn=/^ (W) {6,20}$/;
if (!patrn.exec (s)) return false
return True
}

Check ordinary telephone, fax number: You can "+" start, in addition to numbers, can contain "-"
function Istel (s)
{
var patrn=/^[+]{0,1} (d) {1,3}[]? ([-]? (d) {1,12}) +$/;
var patrn=/^[+]{0,1} (d) {1,3}[]? ([-]? ((d) | []) {1,12}) +$/;
if (!patrn.exec (s)) return false
return True
}

Check mobile phone Number: Must start with a number, in addition to the number, can contain "-"
function Ismobil (s)
{
var patrn=/^[+]{0,1} (d) {1,3}[]? ([-]? ((d) | []) {1,12}) +$/;
if (!patrn.exec (s)) return false
return True
}

Check ZIP code
function Ispostalcode (s)
{
var patrn=/^[a-za-z0-9]{3,12}$/;
var patrn=/^[a-za-z0-9]{3,12}$/;
if (!patrn.exec (s)) return false
return True
}

Verify Search Keywords
function Issearch (s)
{
var patrn= "/^[^ ' ~!@#$%^&* () +=|\][]{}:; ',. <>/?] {1} [^ ' ~!@$%^& () +=|\] []{}:; ',. <>?] {0,19}$/";
if (!patrn.exec (s)) return false
return True
}

Function IsIP (s)//by zergling
{
var patrn=/^[0-9.] {1,20}$/;
if (!patrn.exec (s)) return false
return true
}