title: PERL regex for discord id that ends after 4th digit
body: <p>I tried using this which appears to work..</p>
  
  <p>^.*#[0-9]{4}$</p>
  
  <p>test#1234</p>
  
  <p>Except this also is accepted as valid input.</p>
  
  <p>test#1234 #1234</p>
  
  <p>How do I go about making it so that after the 4 digits no other characters will be accepted without hindering the initial match?</p>
  
  <p>Thanks in advance for the help.</p>