title: Regular Expression Exact match numbers characters digits special characters
body: <p>i am looking for a regular expression to have EXACT 8 ocurrences,
  these occurences may be characters, numbers, special characters,etc..</p>
  
  <p>I thought about this regex: .{8}
  But this allows you to enter more and is not an exact match,</p>
  
  <p>Who could help me?
  Greetings</p>