title: ReGex for surrounding numbers with whitespaces
body: <p>I would like to find a Regex to convert string like the following one:</p>
  
  <pre><code>wienerstr256pta 18 graz austria8051 4
  </code></pre>
  
  <p>Into the following one:</p>
  
  <pre><code>wienerstr 256 pta 18 graz austria 8051 4
  </code></pre>
  
  <p>So I just want to surround every number set between spaces.</p>
  
  <p>I know I can easily find the digits by: </p>
  
  <pre><code>/[0-9]+/g
  </code></pre>
  
  <p>But how can I replace this match with the same content plus extra whitespaces?</p>