A regular checksum method for JavaScript scripting language

There are many types of regular calibration methods, some may be more complex and difficult to remember, I have listed here a few common methods, convenient query.

//whether the checksum is all made up of numbers
function Isshuzi (s)
{
var patrn=/^[0-9]{1,20}$/;
if (!patrn.exec (s)) return false
return True
}
//Check Login name: only input5-20start with a letter, with numbers,"_","."the string
function Isregisterusername (s)
{
var patrn=/^[a-za-z]{1} ([a-za-z0-9]|[. _]) {4,19}$/;
if (!patrn.exec (s)) return false
return True
}
//Verify user name: Only input1-30A string that starts with a letter
function Istruename (s)
{
var patrn=/^[a-za-z]{1,30}$/;
if (!patrn.exec (s)) return false
return True
}
//Check Password: only input6-20letters, numbers, underscores
function ispasswd (s)
{
var patrn=/^ (\w) {6,20}$/;
if (!patrn.exec (s)) return false
return True
}
//Verify regular telephone and fax number: Yes"+"In addition to numbers, it 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, except the number, can contain"-"
function Ismobil (s)
{
var patrn=/^[+]{0,1} (\d) {1,3}[]? ([-]? ((\d) | []) {1,12}) +$/;
if (!patrn.exec (s)) return false
return True
}
//Verifying zip Codes
function Isyoubian (s)
{
var patrn=/^[a-za-z0-9]{3,12}$/;
var patrn=/^[a-za-z0-9]{3,12}$/;
if (!patrn.exec (s)) return false
return True
}
//Verifying search Keywords
function Issearch (s)
{
var patrn=/^[^ ' [email protected]#$%^&* () +=|\\\][\]\{\}:;\ ' \,.<>/?] {1} [^ ' [email protected]$%^& () +=|\\\] [\]\{\}:;\ ' \,.<>?] {0,19}$/;
if (!patrn.exec (s)) return false
return True
}
function IsIP (s)
{
var patrn=/^[0-9.] {1,20}$/;
if (!patrn.exec (s)) return false
return True
}
Function Isbetween (Val, lo, hi) {
if (Val < lo) | | (val > Hi)) {//val is any value, lo is the minimum value, HI is the highest value

return (false);

}
else {return (true);}//Search for intermediate values (that is, not the maximum or minimum value)
}
// Verify Date

Function IsDate (thestr) {
var the1st = thestr.indexof ('-');
var the2nd = thestr.lastindexof ('-');
if (the1st = = the2nd) {return (false);}
Else {
var y = thestr.substring (0,the1st);
var m = thestr.substring (the1st+1,the2nd);
var d = thestr.substring (the2nd+1,thestr.length);
var maxdays = 31;
if (Isint (m) ==false | | isint (d) ==false | | isint (y) ==false) {
return (false);
Else if (Y.length < 4) {return (false);}
Else if (!isbetween (M, 1,)) {return (false);}
Else if (m==4 | | m==6 | | m==9 | | m==11) maxdays = 30;
Else if (m==2) {
if (y% 4 > 0) maxdays = 28;
Else if (y% = = 0 && y% > 0) maxdays = 28;
Else maxdays = 29;
}
if (Isbetween (d, 1, maxdays) = = False) {return (false);}
Else {return (true);}
}
}
// verify null values

function IsEmpty (str) {
if ((str==null) | | | (str.length==0)) return true;
else return (false);
}
// verifies whether an integer
function Isint (THESTR) {
var flag = true;
if (IsEmpty (THESTR)) {flag=false;}
Else
{for (var i=0; i<thestr.length; i++) {
if (IsDigit (thestr.substring (i,i+1)) = = False) {
Flag = false; Break
}
}
}
return (flag);
}
// Verify Email

function Isemail (THESTR) {
var atindex = thestr.indexof (' @ ');
var dotindex = Thestr.indexof ('. ', Atindex);
var flag = true;
Thesub = thestr.substring (0, dotindex+1)
if ((Atindex < 1) | | (Atindex! = Thestr.lastindexof (' @ ')) | | (Dotindex <atindex + 2) | | (Thestr.length <= thesub.length))
{return (false);}
else {return (true);}
}
"^\\d+$"//nonnegative integer (positive integer + 0)
"^[0-9]*[1-9][0-9]*$"//Positive integer
"^ ((-\\d+) | (0+)) $ "//non-positive integer (negative integer + 0)
"^-[0-9]*[1-9][0-9]*$"//Negative integer
"^-?\\d+$"//Integer
"^\\d+ (\\.\\d+)? $"//non-negative floating-point number (positive floating point + 0)
^ ([0-9]+\\]. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\\. [0-9]+) | ([0-9]*[1-9][0-9]*)) $ "//positive floating-point number
"^ ((-\\d+ (\\.\\d+)?) | (0+ (\\.0+)?)) $ "//non-positive floating-point number (negative floating-point number +0)
^ (-([0-9]+\\]. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\\. [0-9]+) | ([0-9]*[1-9][0-9]*))) $ "//negative floating-point number
^ (-?\\d+) (\\.\\d+)? $ "//floating-point number
"^[a-za-z]+$"//A string consisting of 26 English letters
"^[a-z]+$"//A string consisting of 26 uppercase letters in English
"^[a-z]+$"//String consisting of 26 English letters in lowercase
"^[a-za-z0-9]+$"//string consisting of a number and 26 English letters
"^\\w+$"//A string consisting of numbers, 26 letters or underscores
"^[\\w-]+ (\\.[ \\w-]+) *@[\\w-]+ (\\.[ \\w-]+) +$ "//email address
"^[a-za-z]+://(\\w+ (-\\w+) *) (

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A regular checksum method for JavaScript scripting language