title: change order of columns with regex
body: <p>I have columns like:</p>
  
  <pre><code>9   100 100 0
              10
              20
              30
          110 0
              10
              20
              30
          120 0
              10
              20
              30
      120 100 0
              10
              20
              30
  </code></pre>
  
  <p>I want to reverse the order of the columns like:</p>
  
  <pre><code>\3\2\1\0
  </code></pre>
  
  <p>This is how I try to get one column:</p>
  
  <pre><code>(\t?|\d+)
  </code></pre>
  
  <p>It makes sense to me but it aint working, does anyone see the mistake?</p>
  
  <p>After that it assume it is repeating:</p>
  
  <pre><code>(\t?|\d+)(\t?|\d+)(\t?|\d+)(\t?|\d+)
  </code></pre>
  
  <p>Followed with:</p>
  
  <pre><code>\3\2\1\0
  </code></pre>
  
  <p>Can someone help me with fixing it?</p>