0.1.67
======
* [PR #201](https://github.com/rust-lang-nursery/regex/pull/201):
Fix undefined behavior in the `regex!` compiler plugin macro.
* [PR #205](https://github.com/rust-lang-nursery/regex/pull/205):
More improvements to DFA performance. Competitive with RE2. See PR for
benchmarks.
* [PR #209](https://github.com/rust-lang-nursery/regex/pull/209):
Release 0.1.66 was semver incompatible since it required a newer version
of Rust than previous releases. This PR fixes that. (And `0.1.66` was
yanked.)
0.1.66
======
* Speculative support for Unicode word boundaries was added to the DFA. This
should remove the last common case that disqualified use of the DFA.
* An optimization that scanned for suffix literals and then matched the regular
expression in reverse was removed because it had worst case quadratic time
complexity. It was replaced with a more limited optimization where, given any
regex of the form `re$`, it will be matched in reverse from the end of the
haystack.
* [PR #202](https://github.com/rust-lang-nursery/regex/pull/202):
The inner loop of the DFA was heavily optimized to improve cache locality
and reduce the overall number of instructions run on each iteration. This
represents the first use of `unsafe` in `regex` (to elide bounds checks).
* [PR #200](https://github.com/rust-lang-nursery/regex/pull/200):
Use of the `mempool` crate (which used thread local storage) was replaced
with a faster version of a similar API in @Amanieu's `thread_local` crate.
It should reduce contention when using a regex from multiple threads
simultaneously.
* PCRE2 JIT benchmarks were added. A benchmark comparison can be found
[here](https://gist.github.com/anonymous/14683c01993e91689f7206a18675901b).
(Includes a comparison with PCRE1's JIT and Oniguruma.)
* A bug where word boundaries weren't being matched correctly in the DFA was
fixed. This only affected use of `bytes::Regex`.
* [#160](https://github.com/rust-lang-nursery/regex/issues/160):
`Captures` now has a `Debug` impl.