03. Dezember 2021

Telephone Number Validator

Telefonnummern auf ein bestimmtes Format überprüfen.

function telephoneCheck(str) {
  
  const pattern = /^([1]?[-. ]?)?\(?[0-9]{3}\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;
  const bracketOpen = str.indexOf("(");
  const bracketClose = str. indexOf(")");

  if (
    (bracketOpen > -1 && bracketClose == -1) ||
    (bracketOpen == -1 && bracketClose > -1)
  ) {
    return false;
  }

  return pattern.test(str);
}

console.log(telephoneCheck("1 555-555-5555"));

telephoneCheck("555-555-5555") should return a boolean.

telephoneCheck("1 555-555-5555") should return true.

telephoneCheck("1 (555) 555-5555") should return true.

telephoneCheck("5555555555") should return true.

telephoneCheck("555-555-5555") should return true.

telephoneCheck("(555)555-5555") should return true.

telephoneCheck("1(555)555-5555") should return true.

telephoneCheck("555-5555") should return false.

telephoneCheck("5555555") should return false.

telephoneCheck("1 555)555-5555") should return false.

telephoneCheck("1 555 555 5555") should return true.

telephoneCheck("1 456 789 4444") should return true.

telephoneCheck("123**&!!asdf#") should return false.

telephoneCheck("55555555") should return false.

telephoneCheck("(6054756961)") should return false.

telephoneCheck("2 (757) 622-7382") should return false.

telephoneCheck("0 (757) 622-7382") should return false.

telephoneCheck("-1 (757) 622-7382") should return false.

telephoneCheck("2 757 622-7382") should return false.

telephoneCheck("10 (757) 622-7382") should return false.

telephoneCheck("27576227382") should return false.

telephoneCheck("(275)76227382") should return false.

telephoneCheck("2(757)6227382") should return false.

telephoneCheck("2(757)622-7382") should return false.

telephoneCheck("555)-555-5555") should return false.

telephoneCheck("(555-555-5555") should return false.

telephoneCheck("(555)5(55?)-5555") should return false.

telephoneCheck("55 55-55-555-5") should return false.

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