title: Remove first character from Ruby string using [1..n]
body: <p>I'm trying to basically trying to remove the <code>.</code> in the the string <code>.extension</code></p>
  
  <p>So I'm using</p>
  
  <pre><code>'.extension'[1..10] #gives extension
  </code></pre>
  
  <p>Of course this will work for 10 characters, how would I make it work for any length. I dont know what to search for because I dont know what this array style <code>[x..y]</code> is called. </p>