Member Avatar for Xessa

I have phone area textbox and i want to test it against values like 1111111 or 9999999.

I want at least 1 character to be different in this text area(it is exactly 7 characters long)

How can i do this in its shortest way?

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  • Latest Post Latest Post by ShawnCplus

Dani AI

Generated

Short answer: the goal is to reject strings of length seven where every character is the same (for example "1111111"). is right to look at repetition patterns; there are two tidy ways to enforce this depending on whether you prefer a single regex or a clear, easy-to-read check.

A simple, readable JavaScript approach (no complex backreferences):

function isInvalidPhone(s) {
  s = (s || "").trim();
  if (s.length !== 7) return true;          // not seven characters => invalid
  return s === s[0].repeat(7);              // invalid when all seven chars are identical
}

A compact single-regex solution that accepts exactly seven digits but rejects seven identical digits:

// true when valid: exactly seven digits and not all the same
var valid = /^(?!([0-9])\1{6})[0-9]{7}$/.test(input);

Notes: always trim and normalize the input first, and decide whether separators or parentheses are allowed (strip them before validating). String.prototype.repeat is ES6; if you must support very old engines, replace it with a short loop. Do server-side validation as well, and favour the clearer approach in codebases where readability and maintainability matter; use the single-regex option when you need compact, one-step validation.

Member Avatar for ShawnCplus

You should still make your checks for length before this but this will check for numbers like 1111111 and 999999

var phone_number = "9999999";
if (!/^(\d)\1{6}$/.test(phone_number)) {
  alert('Good phone number');
} else {
  alert('Bad phone number');
}
Edited by ShawnCplus because: n/a
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