Gus Heck created LUCENE-9696:
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Summary: RegExp with group references
Key: LUCENE-9696
URL: https://issues.apache.org/jira/browse/LUCENE-9696
Project: Lucene - Core
Issue Type: Wish
Reporter: Gus Heck
PatternTypingFilter presently relies on java util regexes, but LUCENE-7465
found performance benefits using our own RegExp class instead. Unfortunately
RegExp does not currently report matching subgroups which is key to
PatternTypingFilter's use (and probably useful in other endeavors as well).
What's needed is reporting of sub-groups such that
new RegExp("(foo(.+)")) -->> converted to run atomaton etc --> match found for
"foobar" --> somehow reports getGroup(1) as "bar"
And getGroup() can be called on some object reasonably accessible to the code
using RegExp in the first place.
Clearly there's a lot to be worked out there since the normal usage pattern
converts things to a DFA / run Automaton etc, and subgroups are not a natural
concept for those classes. But if this could be achieved without loosing the
performance benefits, that would be interesting :).
Opening this Wish ticket as encouraged by [~mikemccand] in LUCENE-9575. I
won't be able to work on it any time soon to encourage anyone else interested
to pick it up or to drop links or ideas in here.
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