splitby 2.0.0

Split text by a regex delimiter — a powerful, multi-threaded alternative to cut
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use regex::bytes::Regex;
use std::sync::OnceLock;
use unicode_width::UnicodeWidthStr;

static ANSI_STRIP_REGEX: OnceLock<Regex> = OnceLock::new();

fn ansi_strip_regex() -> &'static Regex {
    ANSI_STRIP_REGEX.get_or_init(|| {
        Regex::new(r"\x1b\[[0-9;]*[a-zA-Z]").expect("ANSI strip regex pattern is valid")
    })
}

// Strips ANSI CSI sequences before measuring, so coloured output aligns correctly.
pub fn display_width(bytes: &[u8]) -> usize {
    let stripped = ansi_strip_regex().replace_all(bytes, b"");
    String::from_utf8_lossy(stripped.as_ref()).width()
}