title: Backreference for regular expressions
body: <p>I am trying to find an editor in Android that can backreference regular expressions in substitutions.</p>
  
  <p>If I input the following in the Jota+ editor</p>
  
  <pre><code>two one
  </code></pre>
  
  <p>and use the search string</p>
  
  <pre><code>(two) (one)
  </code></pre>
  
  <p>it will find the target, but I can not find the replacement string. I have tried</p>
  
  <pre><code>\2 \1
  </code></pre>
  
  <p>and</p>
  
  <pre><code>$2 $1
  </code></pre>
  
  <p>but they are only interpreted literally.
  I naturally wish to obtain the result</p>
  
  <pre><code>one two
  </code></pre>
  
  <p>How can I do that with an Android editor app in the phone?</p>