The path to 1.0 should including reaching some kind of finality on the API. The current API has changed very little since inception, and I mostly expect that to be true for 1.0. However, there are some things to consider that might affect the API.

1. Adding a new impl Replacer for &Replacer. #83
2. Tweak the return value of reg_replace to support more use cases. #151
3. Add "multi regexes". #156
4. Is the Replacer trait right? Its no_expand method seems a little kludgy, and it might be possible to remove it entirely.

Additionally, performance is important, so I think #66 (and consequently, #146) should be included as well.

I've left out #85 (exposing an API for matching on &[u8]) for now. Maybe it should be part of 1.0, but it seems like something that probably ought to be bolted on via a sub-module.