On Sun, Apr 5, 2015 at 5:08 PM, code fx9 <code...@gmail.com> wrote: > Hi, > We are using Lucene indirectly via ElasticSearch. We would like to use RE2 > syntax for running regex queries against Lucene. We are already using RE2 > syntax for other parts of our system, so not ability to use the same syntax > is a deal-breaker for us. > > Recently Google has released a pure Java implementation of this library on > GitHub. Will it be possible to actually use RE2/J library to run regex > queries in Lucene? I understand that it might require customizing Lucene > source code. Can you give me any idea how complex and time consuming such > endeavor might be. > > RE2 Syntax: https://re2.googlecode.com/hg/doc/syntax.html > RE2/J :https://github.com/google/re2j > > Thanks.
The only place in lucene that "knows" about syntax is RegexpQuery. It only has logic for parsing that syntax into a state machine (Automaton class), otherwise AutomatonQuery takes care of the execution. Maybe you could create an Re2Query class that works in a similar way: e.g. uses RE2/J library to parse the syntax into its state machine representation and translates that to Automaton representation used by Lucene. --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
