codewars/postal-code-checker.js at master · g1yk/codewars · GitHub

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/*
  Title:
    Russian postal code checker
  Description:
    You should write a simple function that takes string as input and checks if it is a valid Russian postal code, returning true or false.
    A valid postcode should be 6 digits with no white spaces, letters or other symbols. Empty string should also return false.
    Please also keep in mind that a valid post code cannot start with digit 0, 5, 7, 8 or 9
    Valid postcode example 198328, 310003, 424000
    Invalid postcode examples 12A483, 1@63, 111, 056879
  Kata Link:
    https://www.codewars.com/kata/russian-postal-code-checker
  Discuss Link:
    https://www.codewars.com/kata/russian-postal-code-checker/discuss
  Solutions Link:
    https://www.codewars.com/kata/russian-postal-code-checker/solutions
*/

// Long Solution
const zipvalidate = postcode => /^[12346]\d{5}$/g.test(postcode)

// Function Export
module.exports = zipvalidate