Solr doesn't provide any regex based searching features out of the box. There are some regex based query classes in lucene, if you wrote a custom Solr plugin to do the query parsing, you could use them.
Your question appears to be an "XY Problem" ... that is: you are dealing with "X", you are assuming "Y" will help you, and you are asking about "Y" without giving more details about the "X" so that we can understand the full issue. Perhaps the best solution doesn't involve "Y" at all? See Also: http://www.perlmonks.org/index.pl?node_id=542341 http://people.apache.org/~hossman/#xyproblem If you could elaborate a little more on the exact use case you are trying to solve, people might be able to offer you alternative solutions you've never thought of ... supporting regex search is a much harder problem then finding creative ways to support range queries on unclean data (which is what the root of your issue seems to be). Tell us more about your data, and the types of queries you need to support (without making the assumption that regexes is the best way to support them) -Hoss
