Accept all numbers except 5 consecutive zeros : Javascript

Question

I want to validate a 5 digit number which should not be 00000. All numbers except 00000 are allowed.

examples : 01201 , 00001, 21436 , 45645 are valid numbers and 1,

Answer 1

No need for negative lookahead

Live Demo

function isvalid5(str) {
  return str != "00000" && /^\d{5}$/.test(str);
}