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]>> { ... }
fn by_ref<'r>(&'r mut self) -> ReplacerRef<'r, Self> { ... }
}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[0]).
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.
fn by_ref<'r>(&'r mut self) -> ReplacerRef<'r, Self>
Return a Replacer that borrows and wraps this Replacer.
This is useful when you want to take a generic Replacer (which might
not be cloneable) and use it without consuming it, so it can be used
more than once.
Example
use regex::bytes::{Regex, Replacer}; fn replace_all_twice<R: Replacer>( re: Regex, src: &[u8], mut rep: R, ) -> Vec<u8> { let dst = re.replace_all(src, rep.by_ref()); let dst = re.replace_all(&dst, rep.by_ref()); dst.into_owned() }