Regexp query case-insensitive flag

Hi there! I have a question regarding regexp query. Is there any way to
enable case-insensitive flag when doing regexp query? I didn't find any way
to specify that. Also, not in regex filter, or the regex functionality in
query string query. However, it is available in Terms facet regex patterns.
Is that not available or just I didn't find it?

Thank you in advance,
Guoxing

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Unfortunately, I don't believe this is available at the moment.

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