JS Phone number verification function

Requirements: One, mobile phone number is 11 or 12 digits, if 12 digits, then the first digit is 0
The first and second digits of the 11-digit mobile phone number are "13"
The second and third digits of the 12-digit mobile phone number are "13"
Purpose: Check whether the input mobile phone number is correct
Input:
S: string
Return:
Returns False if the validation returns true
*/
Java code

1. function F_check_mobile (obj) {
2. var regu =/(^[1][3][0-9]{9}$) | (^0[1][3][0-9]{9}$)/;
3. var re = new RegExp (Regu);
4. if (Re.test (Obj.value)) {
5. return true;
6.}
7. F_alert (obj, "Please enter the correct mobile phone number");
8. return false;
9.}
10.

function F_check_mobile (obj) {
var regu =/(^[1][3][0-9]{9}$) | (^0[1][3][0-9]{9}$)/;
var re = new RegExp (Regu);
if (Re.test (Obj.value)) {
return true;
}
F_alert (obj, "Please enter the correct mobile phone number");
return false;
}

/*
Requirements: First, the number of telephone numbers, "(", ")" and "-" constitute
Two, the telephone number is 3 to 8 digits
If the phone number contains an area code, then the area code is three digits or four digits
Four, the area code with "(", ")" or "-" and other parts separated
Purpose: Check the format of the phone number you entered correctly
Input:
Strphone: String
Return:
Returns False if the validation returns true
*/
Java code

  1. function F_check_phone (obj)   
   2. { 
   3.     var regu =/(^ ([0][1-9]{2,3}[-]) d{3,8} (-d{1,6})? $) | ( ^ ([0][1-9]{2,3}) d{3,8} ((d{1,6})? $) | (^d{3,8}$)/;  
   4.     var re = new RegExp (regu); 
   5.     if (re.test (obj.value)) { 
   6.       return true; 
   7.    } 
   8.     f_ Alert (obj, "Please enter the correct phone number"); 
   9.     return false; 
  10.}  
  11.   

Function F_check_phone (obj)
{
    var regu =/(^ ([0][1-9]{2,3}[-]) d{3,8} (-d{1,6})? $) | ( ^ ([0][1-9]{2,3}) d{3,8} ((d{1,6})? $) | (^d{3,8}$)/;
    var re = new RegExp (Regu);
    if (re.test (Obj.value)) {
      return true;
  & nbsp
    F_alert (obj, "Please enter the correct phone number");
    return false;
}