Function neure::re::count_if

pub fn count_if<'a, const M: usize, const N: usize, C, U, F>(
    re: U,
    if: F
) -> NeureRepeat<M, N, C, U, F>where
    C: Context<'a> + 'a,
    U: Neu<C::Item>,
    F: NeuCond<'a, C>,

Match the given Neu M ..= N times.

Example

    let website = re::count_if::<0, { usize::MAX }, _, _, _>(
        ('a'..'{').or('.'),
        |ctx: &CharsCtx, pair: &(usize, char)| {
            Ok(pair.1 != '.'
                || ctx
                    .orig()?
                    .get((pair.0 + 1)..)
                    .map(|v| v.find('.').is_some())
                    .unwrap_or(false))
        },
    );
    let mut ctx = CharsCtx::new("domain.example.com");

    assert_eq!(ctx.try_mat(&website)?, Span::new(0, 14));
    assert_eq!(ctx.orig_sub(0, 14)?, "domain.example");
    Ok(())
}