How to avoid to enter repeated number in input text form?

Question

I'm trying past few days to solve input number form validation in javascript. The logic user doesn't allow to enter repeated same number like "00000000000", "11111111111". If they enter numbers on text field i have to show error message,

sample code,

var mobNumber = $('#phNo').val();

if(mobNumber.match("00000000") || mobNumber.match("1111111")) {
  alert('Please enter valid phone number');
}

yes i tried. User can able to enter both mobile and landline numbers — Sathya, Mar 31 '17 at 09:09
http://stackoverflow.com/questions/3813195/regular-expression-for-indian-mobile-numbers — Jack jdeoel, Mar 31 '17 at 09:10
Do you mean that a number should not be the same as the previous number or that all 8 digits should not be the same number? — Cara, Mar 31 '17 at 09:10
Regex to find repeating numbers: http://stackoverflow.com/questions/6507982/regex-to-find-repeating-numbers — helb, Mar 31 '17 at 09:11
@CaraTilos if i enter first six characters are the same number i have to display error — Sathya, Mar 31 '17 at 09:21
@DavidJorHpan it can be any kind of phone numbers like landline or mobile number — Sathya, Mar 31 '17 at 09:23

Alessandro · Answer 1 · 2017-03-31T09:29:56.643

2

You could use following regex ^(\d)\1+$ :

^ asserts position at start of the string
(...) 1st capturing group
\d matches a digit (equal to [0-9])
\1 matches the same text as most recently matched by the 1st capturing group
+ Quantifier, matches between one and unlimited times, as many times as possible, giving back as needed
$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any).

See following example:

function test(par){
  if(par.match(/^(\d)\1+$/g)){
    console.log(par + " is not valid");
  }else{
    console.log(par + " is valid");
  }
}

test("11111111");
test("11131111");
test("111a1111");
test("010101010");
test("9999");

I hope it helps you. Bye

edited Mar 31 '17 at 09:29

answered Mar 31 '17 at 09:26

Alessandro

4,382
8
36
70

looks like the OP wants something inverse, I mean `11111111` should be invalid. – King King Mar 31 '17 at 09:28
Oh I could change it, the logic is the same. – Alessandro Mar 31 '17 at 09:29
Ok, I simply changed the log messages with "is not valid" when regex match otherwise I print "is valid" – Alessandro Mar 31 '17 at 09:32

score 0 · Answer 2 · answered Mar 31 '17 at 09:22

You can simply write code like

$(document).on('input', '#phNo', function() {
    var mobNumber = $(this).val();
    var res = mobNumber/(mobNumber/10);
    if(res == 111111111) {
      alert('Please enter valid phone number');
    }
});

this is applicable for all numbers and you have to check the max and min length of the input ..

score 0 · Answer 3 · edited Mar 31 '17 at 09:40

0

try this :

var checkPhone = function() {
  phone_number = $('#phone').val();
  res = (/^(.)\1+$/.test(phone_number) ? '1' : '0');
  if(res == '1'){
    return 'bad phone number';
  } else {
    return 'good phone number';
  }
}

Test it here : JSFIDDLE

edited Mar 31 '17 at 09:40

clinton3141

4,751
3
33
46

answered Mar 31 '17 at 09:31

kanzari

87
4

score 0 · Answer 4 · answered Mar 31 '17 at 09:35

You can try like this,

var phone = "11111111";
            var phonecount = phone.length;
            var countLength = 0;
            for (var i in phone)
            {
                if(phone.substring(0,1)==phone[i])
                {
                    countLength = countLength + 1;
                }
            }
            if (countLength == phonecount)
            alert("Please enter valid phone number");

How to avoid to enter repeated number in input text form?

4 Answers4