Trait regex::bytes::Replacer [−] [src]

pub trait Replacer {
    fn replace_append(&mut self, caps: &Captures, dst: &mut Vec<u8>);

    fn no_expansion<'r>(&'r mut self) -> Option<Cow<'r, [u8]>> { ... }
}

Replacer describes types that can be used to replace matches in a byte string.

In general, users of this crate shouldn't need to implement this trait, since implementations are already provided for &[u8] and FnMut(&Captures) -> Vec<u8>, which covers most use cases.

Required Methods

fn replace_append(&mut self, caps: &Captures, dst: &mut Vec<u8>)

Appends text to dst to replace the current match.

The current match is represented by caps, which is guaranteed to have a match at capture group 0.

For example, a no-op replacement would be dst.extend(caps.at(0).unwrap()).

Provided Methods

fn no_expansion<'r>(&'r mut self) -> Option<Cow<'r, [u8]>>

Return a fixed unchanging replacement byte string.

When doing replacements, if access to Captures is not needed (e.g., the replacement byte string does not need $ expansion), then it can be beneficial to avoid finding sub-captures.

In general, this is called once for every call to replacen.

Implementors