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https://issues.apache.org/jira/browse/LUCENE-9371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Harwood resolved LUCENE-9371.
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Resolution: Fixed
Fixed in master and backported to branch_8x in
https://github.com/apache/lucene-solr/commit/9d6c738ffce0c3164691f161ba8b92a615b1e062
> Make RegExp internal state more visible to support more rendering formats
> -------------------------------------------------------------------------
>
> Key: LUCENE-9371
> URL: https://issues.apache.org/jira/browse/LUCENE-9371
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Mark Harwood
> Assignee: Mark Harwood
> Priority: Minor
>
> This is a proposal to open up read-only access to the internal state of
> RegExp objects.
> The RegExp parser provides a useful parsed object model for regular
> expressions. Today it offers three rendering functions:
> 1) To Automaton (for query execution)
> 2) To string (for machine-readable regular expressions)
> 3) To StringTree (for debug purposes)
> There are at least 2 other rendering functions that would be useful:
> a) To "Explain" format (like the plain-English descriptions used in [regex
> debugging tools|https://regex101.com/r/2DUzac/1])
> b) To Query (queries used to accelerate regex searches by providing an
> approximation of the search terms and [hitting an ngram
> index|https://github.com/wikimedia/search-extra/blob/master/docs/source_regex.md])
> To support these and other renderings/transformations it would be useful to
> open read-only access to the fields held in RegExp objects - either through
> making them public finals or offering getter access methods. This would free
> the RegExp class from having to support all possible transformations.
>
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