title: Solr DIH regexTransformer seems to only know about one capturing parentheses group
body: <p>I am importing data using the DIH and have a need to parse a string, capture two numbers, then populate a field of type=location (which accepts a "lat,long" coordinate pair).  The logical thing to do is:</p>
  
  <pre><code>  &lt;field column="latLong" 
           regex="Latitude is ([-\d.]+)\s+ Longitude is ([-\d.]+)\s+" 
           replaceWith="$1,$2" /&gt;
  </code></pre>
  
  <p>It seems the DIH only knows about a single capture group. So $2 is never used. </p>
  
  <p>Has anyone ever used more than one capture with the regexTransformer?  Searching the documentation didn't provide any examples of $2 or $3. What gives, O ye priests of Solr?</p>