perl-regex 0.13.3

Regex parsing and validation helpers for Perl syntax
Documentation 
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pub(crate) fn parse_named_capture_name(
    bytes: &[u8],
    pos: usize,
    open_delim: u8,
    close_delim: u8,
) -> Option<(String, usize)> {
    if pos >= bytes.len() || bytes[pos] != open_delim {
        return None;
    }
    let mut i = pos + 1;
    let start = i;
    while i < bytes.len() && bytes[i] != close_delim {
        i += 1;
    }
    if i == start || i >= bytes.len() {
        return None;
    }
    Some((String::from_utf8_lossy(&bytes[start..i]).into_owned(), i + 1))
}

pub(crate) fn parse_named_capture_name_from(
    bytes: &[u8],
    start: usize,
    close_delim: u8,
) -> Option<(String, usize)> {
    if start >= bytes.len() {
        return None;
    }
    let mut i = start;
    while i < bytes.len() && bytes[i] != close_delim {
        i += 1;
    }
    if i == start || i >= bytes.len() {
        return None;
    }
    Some((String::from_utf8_lossy(&bytes[start..i]).into_owned(), i + 1))
}