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telephone-number-validator.html
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<!DOCTYPE html>
<html>
<body>
<script>
//https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator
//Return true if the passed string looks like a valid US phone number.
function telephoneCheck(str) {
const regexp2 = /^(1\s?)?(\(\d{3}\)|\d{3})[\s\-]?\d{3}[\s\-]?\d{4}$/;
return regexp2.test(str);
}
//tests
console.log(telephoneCheck("555-555-5555"));
console.log(telephoneCheck("1 555-555-5555"));
console.log(telephoneCheck("1 (555) 555-5555"));
console.log(telephoneCheck("5555555555"));
console.log(telephoneCheck("(555)555-5555"));
console.log(telephoneCheck("1(555)555-5555"));
console.log(telephoneCheck("555-5555"));
console.log(telephoneCheck("5555555"));
console.log(telephoneCheck("1 555)555-5555"));
console.log(telephoneCheck("1 555 555 555"));
console.log(telephoneCheck("(6054756961)"));
console.log(telephoneCheck("2 (757) 622-7382"));
console.log(telephoneCheck("0 (757) 622-7382"));
console.log(telephoneCheck("-1 (757) 622-7382"));
console.log(telephoneCheck("10 (757) 622-7382"));
console.log(telephoneCheck("27576227382"));
console.log(telephoneCheck("555)-555-5555"));
console.log(telephoneCheck("(555-555-5555"));
console.log(telephoneCheck("(555)5(55?)-5555"));
</script>
</body>
</html>