Regular Expression not Passing Only Two Tests

Tell us what’s happening:
I’m having trouble getting the strings "1 555)555-5555" and "(555-555-5555" to return false. The issue is with the single parenthesis either to the left or right of the area code. I’ve spent a few hours researching on how to change my regex. After reading through the MDN cheatsheet for regular expressions as well as Stack Overflow, I’ve tried using a lookahead assertion around the area code to pass the parenthesis only if its matching closer/opener is included, but that just made more of the tests not pass.

Any tips or hints to help point me in the right direction are greatly appreciated.

  **Your code so far**

function telephoneCheck(str) {
let regExp = /^1*\s*\(*\d{3}-*\s*\)*\s*\d{3}-*\s*\d{4}$/;
if (str.match(regExp)) {
  return true;
} else {
  return false;

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0

Challenge: Telephone Number Validator

Link to the challenge:

The first step is to understand why something is matching your pattern when it should not be. Do you understand why 1 555)555-5555 is matching when it shouldn’t be? I would suggest you concentrate on just this sub problem for a bit. It seems that there are two ways you can represent an area code here. Do you know of a way you can match for either one pattern OR another pattern?

1 Like

Solved it. Yes, I understood why the strings were matching when they shouldn’t have been. Turns out the part that was tripping me up was where to place parentheses along with OR |. I experimented with it prior to posting here, but you helped solidify it for me. Thank you for your help!

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