Mark Harwood created LUCENE-9386:
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Summary: RegExpQuery - add case insensitive matching option
Key: LUCENE-9386
URL: https://issues.apache.org/jira/browse/LUCENE-9386
Project: Lucene - Core
Issue Type: Improvement
Components: core/search
Reporter: Mark Harwood
In searches sometimes case sensitivity is important and sometimes not.
However, users don't want to have to index two versions of their data
(lowercased and original) in order to service both case sensitive and case
insensitive queries. To get around this users have been commonly seen to take a
user query e.g. `powershell.exe` and search for it with the regex
`[Pp][Oo][Ww][Ee][Rr][Ss][Hh][Ee][Ll][Ll]\.[Ee][Xx][Ee]`.
The proposal is that we add an extra "case insensitive" option to the RegExp
query flags to automatically do this sort of expansion when we create
Automatons.
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