Function onig_sys::onig_number_of_capture_histories

pub unsafe extern "C" fn onig_number_of_capture_histories(
    reg: OnigRegex
) -> c_int

Return the number of capture history defined in the pattern.

int onig_number_of_capture_histories(regex_t* reg)

You can't use capture history if ONIG_SYN_OP2_ATMARK_CAPTURE_HISTORY is disabled in the pattern syntax.(disabled in the default syntax)

arguments

1. reg: regex object.