[Libreoffice-bugs] [Bug 78840] Add the regular expression (?ismwx-ismwx: ... ) Flag settings. Evaluate parenthesized expression with specifics flags enabled or -disabled. To have a case sensitive mode in functions using regular expressions.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=78840

--- Comment #13 from Mike Kaganski <mikekaganski at hotmail.com> ---
i18npool/source/search/textsearch.cxx

TextSearch::setOptions2 handles rOptions.transliterateFlags and initializes
xTranslit for IGNORE_CASE. Then it calls RESrchPrepare, where it adds
UREGEX_CASE_INSENSITIVE to nIcuSearchFlags. Then in
searchForward/searchBackward it uses the transliteration service to get
lowercase version of original string, thus making regex engine unable to make
reasonable use of (?-i) flag.

There's a comment in TextSearch::RESrchPrepare:

> // Note that the search flag ALL_IGNORE_CASE is deprecated in UNO
> // probably because the transliteration flag IGNORE_CASE handles it as well.

So maybe in case of regex search, transliteration service should not be
used/should do nothing? The UREGEX_CASE_INSENSITIVE should already do the
trick?

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