JavaScript：字符删除代码的意外结果

Question

我的代码未通过测试用例“应删除paren，空格，连字符和点”和“应该验证11位数字，并以1开头，即使是标点符号”。

以前通过删除字符的情况然后在添加更多东西后停止，我无法弄清楚它是什么。日志显示pNum剥离了这些字符，但它仍然失败了？

帮帮我调试？以下是测试/结果：https://puu.sh/ziot6/8982a12ad0.png

const phoneNumber = (pNum) => {

  var replaceChars = /[.)( -]/g;

  //removes parenthesis, spaces, hyphens, and dots
  pNum = pNum.replace(replaceChars,"");
  console.log(pNum);

  //returns pNum if length is 11 and starts with 1
  if (pNum.length == 11 && pNum[0] == 1)
      return pNum;

  //returns pNum if length is 11 and starts with 1 and has punctuation
  if (pNum.length == 11 && pNum[0] == 1 && pNum.match(/\W/g))
      return pNum;

  //returns null if pNum is equal or less than 9 or more than 11
  if (pNum.length <= 9 || pNum.length > 11)
      return null;

  //returns null if pNum is 11 without 1 in the first index
  if (pNum.length == 11 && pNum[0] !== 1)
      return null;

  //returns null if pNum has letters or punctuation and less than 11
  if (pNum.match(/[a-z]/i) && pNum.length !== 11)
      return null;

  //return null when area code does not start 2-9
  if (pNum.length == 10 && pNum[0] != ('2','3','4','5','6','7','8','9'))
      return null;
  if (pNum.length == 11 && pNum[1] != ('2','3','4','5','6','7','8','9'))
      return null;

  //return null when exchange code does not start 2-9
  if (pNum.length == 10 && pNum[3] != ('2','3','4','5','6','7','8','9'))
      return null;
  if (pNum.length == 11 && pNum[4] != ('2','3','4','5','6','7','8','9'))
      return null;

}