title: Identify string contents, and verify
body: <p>I'm still fairly new to C#,</p>
  
  <p>I'm making a 'mini-username checker' if you will</p>
  
  <p>so far, the username is 2 numbers, followed by a name,</p>
  
  <p>example </p>
  
  <pre><code>13Samuel
  </code></pre>
  
  <p>which can also be typed as </p>
  
  <pre><code>13samuel
  </code></pre>
  
  <p>What I am trying to do is detect if the first two characters makes a number between 0 and 99 then detect if the third character is a letter (a-z) lowercase or caps.</p>
  
  <p>Thank you for reading,</p>
  
  <p>Samuel</p>