[Codewars] validate code with simple regex (8 kyu) / JavaScript

https://www.codewars.com/kata/56a25ba95df27b7743000016

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DESCRIPTION:

Basic regex tasks. Write a function that takes in a numeric code of any length. The function should check if the code begins with 1, 2, or 3 and return true if so. Return false otherwise.

You can assume the input will always be a number.

 

코드

function validateCode (code) {
  return (/^[123]/).test(code);
}