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.