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…

phoneNumberValidate.js

function telephoneCheck(str) {
  // if str starts with a dash, return false, else replace dashes and spaces with nothing
  if (str[0] == "-"){
    return false;
  }else
    
  str = str.replace(/-|\s/g, "");
  //Location of first parentheses 
  var firstPar = str.search("\\(");
  //Location of second parentheses
  var secondPar = str.search("\\)");
  //Length of the str
  var strLen = str.length;
  
  //Depending on string length
  switch(strLen){
      
    case 10:
      return true;
      
    case 11:
      if (str[0] == 1){
        return true;
      }else
        return false;
      break;
      
    case 12:
      if (str[0] === "(" && str[4] == ")"){
        return true;
      }else
        return false;
      break;
      
    case 13:
      if (str[0] == 1 && firstPar === 1 && secondPar === 5){
        return true;
      }else
        return false;
      break;
    default:
      return false;
  }
}



telephoneCheck("555-555-5555");

telephoneCheck("55 55-55-555-5") should return false.