JavaScript-Algorithms/Telephone-Validator.js at main · rclarkperez/JavaScript-Algorithms · GitHub

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function telephoneCheck(str) {
  let regexOne = /^(\d{3})([-])(\d{3})([-])(\d{4})$/; //555-555-5555
  let regexTwo = /^([(])(\d{3})([)])(\d{3})([-])(\d{4})$/; //(555)555-5555
  let regexThree = /^([(])(\d{3})([)])([' '])(\d{3})([-])|(d{4})$/; //(555) 555-5555
  let regexFour = /^(\d{3})([' '])(\d{3})([' '])(\d{4})$/; //555 555 5555
  let regexFive = /^(\d{10})$/; //5555555555
  let regexSix = /^[1]([' '])([(])(\d{3})([)])([' '])(\d{3})([-])|(d{4})$/; //1 555 555 5555
  let regexSeven =/^[1]([' '])(\d{3})([-])(\d{3})([-])(\d{4})$/; //1 555-555-5555
  let regexEight =/^[1]([' '])(\d{3})([' '])(\d{3})([' '])(\d{4})$/; //1 555 555 5555
  let regexNine = /^[1]([(])(\d{3})([)])(\d{3})([-])(\d{4})$/; //1(555)555-5555
  if (regexOne.exec(str)) {
    return true;
  }
  else if (str.match(regexTwo)) {
    return true;
  }
  else if (str.match(regexThree)) {
    return true;
  }
  else if (str.match(regexFour)) {
    return true;
  }
  else if (str.match(regexFive)) {
    return true;
  }
  else if (str.match(regexSix)) {
    return true;
    }
    else if (str.match(regexSeven)) {
    return true;
    }
     else if (str.match(regexEight)) {
    return true;
    }
    else if (str.match(regexNine)) {
    return true;
    }
  else {
      return false;
  }
}