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David LiAntoine Pitrou
6339ff89ac8
David Li authored and Antoine Pitrou committed d596ca76d78
ARROW-13157: [C++][Python] Add find_substring_regex kernel and implement ignore_case for find_substring

This adds a `find_substring_regex` kernel and adds support for case insensitivity to the `find_substring` kernel.

RE2 only returns the match position if you have a capture group. Hence we have to modify the supplied regex. For literal patterns, we have to use RE2::QuoteMeta instead of setting the literal flag on the regex.

Closes #10597 from lidavidm/arrow-13157

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>