text: // https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator
  
  function telephoneCheck(str) {
      return (/^1? ?(( ?\d{3}[- ]*)|(\( ?\d{3}[- ]*\) *))\d{3}[- ]?\d{4}$/).test(str);
  
   return true;
  }
  
  telephoneCheck("555-555-5555");