title: Ruby idiom for substring from index until end of string
body: <p>Just wondering if there's a Ruby idiom for extracting a substring from an index until the end of the string. I know of <code>str[index..-1]</code> which works by passing in a range object to the <code>String</code>'s <code>[]</code> method but it's a little clunky. In python, for example, you could write <code>str[index:]</code> which would implicitly get you the rest of the string.</p>
  
  <p>Example:</p>
  
  <pre><code>s = "hello world"
  s[6..-1] # &lt;-- "world"
  </code></pre>
  
  <p>Is there anything nicer than <code>s[6..-1]</code>? </p>