title: Regex: Match dot and dash in a 5 digit number
body: <p>I'm trying to use a Regex to match only dot and dash from a number that matches in this format: 
  <code>00.000-0</code></p>
  
  <p>I'd use a two step way: first checking if the number is in this format <code>00.000-0</code> and then matching only the dot and dash, which I'd use a regex pattern like <code>[^\d]</code> or <code>[\.\-]</code>.</p>
  
  <p>But I'm trying to use in a single step, a Regex pattern that matches the dot after the first two digits and the dash followed by respectively, two digits, dot and three digits.</p>
  
  <p>First, I tried in <code>regex101.com</code> with positive lookahead, something like <code>(?=\d\d)\.(?=\d\d\d)\-</code>, but it didn't work. Then I tried <code>(?=\d\d)\.</code>, so at least I tried to the dot <code>.</code> to see if the lookahead was working, but again it didn't work.</p>
  
  <p>I read in <code>Regular-Expressions.info</code> and, apparently, the lookahead format I tried was correct.</p>
  
  <p>Is there something else I can do, it matches the dot and dash, only for this format: <code>00.000-0</code>?</p>