Cleanup regex_expressions.rs to remove _regexp_match function #9106
Description
Is your feature request related to a problem or challenge?
arrow-rs 50 includes this functionality mentioned in a comment in the file:
/// TODO: Remove this once it is included in arrow-rs new release.
/// <https://github.com/apache/arrow-rs/pull/5235>
fn _regexp_match<OffsetSize: OffsetSizeTrait>(
thus this function can be removed and the arrow-rs implementation can be called directly.
As noted in #9102 (comment)
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