Function compile_and_cache_regex

datafusion/functions/src/regex/mod.rs:131–147

(
    regex: &'strings str,
    flags: Option<&'strings str>,
    regex_cache: &'cache mut HashMap<(&'strings str, Option<&'strings str>), Regex>,
)

}

pub fn compile_and_cache_regex<'strings, 'cache>(
    regex: &'strings str,
    flags: Option<&'strings str>,
    regex_cache: &'cache mut HashMap<(&'strings str, Option<&'strings str>), Regex>,
) -> Result<&'cache Regex, ArrowError>
where
    'strings: 'cache,
{
    let result = match regex_cache.entry((regex, flags)) {
        Entry::Occupied(occupied_entry) => occupied_entry.into_mut(),
        Entry::Vacant(vacant_entry) => {
            let compiled = compile_regex(regex, flags)?;
            vacant_entry.insert(compiled)
        }
    };
    Ok(result)
}

pub fn compile_regex(regex: &str, flags: Option<&str>) -> Result<Regex, ArrowError> {
    let pattern = match flags {