CODEWITHSUNDEEP
javascriptregex
ochieng benja
ochieng benja

Reputation: 79

Regular expression to match specific number of digits

I am trying to write a regular expression which returns a three digit integer only. Not less than three or more than three. However my regex below is also true for four digit numbers. Am i missing something?

var threeDigits = /\d{3}$/

console.log(threeDigits.test("12"))// false
console.log(threeDigits.test("123"))// true
console.log(threeDigits.test("1234"))// true yet this is four digits???

Upvotes: 2

Views: 3735

Answers (2)

Mohamed Sahir
Mohamed Sahir

Reputation: 2543

Use either one ^[0-9]{3}$ or ^\d{3}$ .

Upvotes: 0

Ry-
Ry-

Reputation: 224867

You have the ending anchor $, but not the starting anchor ^:

var threeDigits = /^\d{3}$/

Without the anchor, the match can start anywhere in the string, e.g.

"1234".match(/\d{3}$/g)  // ["234"]

Upvotes: 6

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