What should I download to use "RegexQuery"

[mhzmark]

Hi, everybody.
   I am new in lucene technology. I've downloaded lucene-demos-2.2.0.jar and
lucene-core-2.2.0.jar. Then I added these files to my CLASSPATH. And now I can 
successfully import classes like:
   import org.apache.lucene.search.IndexSearcher;
   import org.apache.lucene.search.Query;
   import org.apache.lucene.search.Hits;
   (...)
 etc.

But I can't import:
   import org.apache.lucene.search.regex.RegexQuery;

I've checked that there is no "RegexQuery.class" in lucene-core-2.2.0.jar and 
lucene-demos-2.2.0.jar.
So my question is:
   what additional jar-files should I download to use RegexQuery class.

Thanks, in advance.

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