Function regexp_instr

pub fn regexp_instr(
    values: &dyn Array,
    regex_array: &dyn Datum,
    start_array: Option<&dyn Datum>,
    nth_array: Option<&dyn Datum>,
    flags_array: Option<&dyn Datum>,
    subexpr_array: Option<&dyn Datum>,
) -> Result<Arc<dyn Array>, ArrowError>

arrow-rs style implementation of regexp_instr function. This function regexp_instr is responsible for returning the index of a regular expression pattern within a string array. It supports optional start positions and flags for case insensitivity.

The function accepts a variable number of arguments:

• values: The array of strings to search within.
• regex_array: The array of regular expression patterns to search for.
• start_array (optional): The array of start positions for the search.
• nth_array (optional): The array of start nth for the search.
• endoption_array (optional): The array of endoption positions for the search.
• flags_array (optional): The array of flags to modify the search behavior (e.g., case insensitivity).
• subexpr_array (optional): The array of subexpr positions for the search.

The function handles different combinations of scalar and array inputs for the regex patterns, start positions, and flags. It uses a cache to store compiled regular expressions for efficiency.

Errors

Returns an error if the input arrays have mismatched lengths or if the regular expression fails to compile.