FCC-JavaScriptAlgorithms-and-DataStructuresProjects/Telephone_Number_Validator.js at master · Abhi9935/FCC-JavaScriptAlgorithms-and-DataStructuresProjects · GitHub

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/*
JavaScript Algorithms and Data Structures Projects: Telephone Number Validator

Return true if the passed string looks like a valid US phone number.
The user may fill out the form field any way they choose as long as it has the format of a valid US number.
The following are examples of valid formats for US numbers (refer to the tests below for other variants):
---------------------
555-555-5555
(555)555-5555
(555) 555-5555
555 555 5555
5555555555
1 555 555 5555
------------------------
For this challenge you will be presented with a string such as 800-692-7753 or 8oo-six427676;laskdjf.
Your job is to validate or reject the US phone number based on any combination of the formats provided above.
The area code is required. If the country code is provided, you must confirm that the country code is 1.
Return true if the string is a valid US phone number; otherwise return false.

Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Test Cases:-
Passed
telephoneCheck("555-555-5555") should return a boolean.
Passed
telephoneCheck("1 555-555-5555") should return true.
Passed
telephoneCheck("1 (555) 555-5555") should return true.
Passed
telephoneCheck("5555555555") should return true.
Passed
telephoneCheck("555-555-5555") should return true.
Passed
telephoneCheck("(555)555-5555") should return true.
Passed
telephoneCheck("1(555)555-5555") should return true.
Passed
telephoneCheck("555-5555") should return false.
Passed
telephoneCheck("5555555") should return false.
Passed
telephoneCheck("1 555)555-5555") should return false.
Passed
telephoneCheck("1 555 555 5555") should return true.
Passed
telephoneCheck("1 456 789 4444") should return true.
Passed
telephoneCheck("123**&!!asdf#") should return false.
Passed
telephoneCheck("55555555") should return false.
Passed
telephoneCheck("(6054756961)") should return false
Passed
telephoneCheck("2 (757) 622-7382") should return false.
Passed
telephoneCheck("0 (757) 622-7382") should return false.
Passed
telephoneCheck("-1 (757) 622-7382") should return false
Passed
telephoneCheck("2 757 622-7382") should return false.
Passed
telephoneCheck("10 (757) 622-7382") should return false.
Passed
telephoneCheck("27576227382") should return false.
Passed
telephoneCheck("(275)76227382") should return false.
Passed
telephoneCheck("2(757)6227382") should return false.
Passed
telephoneCheck("2(757)622-7382") should return false.
Passed
telephoneCheck("555)-555-5555") should return false.
Passed
telephoneCheck("(555-555-5555") should return false.
Passed
telephoneCheck("(555)5(55?)-5555") should return false.
*/
//------------------------------------------------------------
function telephoneCheck(str) {
  // Good luck!
  let telValid = /^(1\s?)?(\(\d{3}\)|\d{3})[\s\-]?\d{3}[\s\-]?\d{4}$/;
  return telValid.test(str);
}

telephoneCheck("555-555-5555");