Add short blog post about regex 1.9 release

posts/2023-07-05-regex-1.9.md

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+---
+layout: post
+title: "Announcing regex 1.9"
+author: Andrew Gallant
+---
+
+The regex sub-team is annoncing the release of `regex 1.9`. The `regex` crate
+is maintained by the Rust project and is the recommended way to use regular
+expressions in Rust. Its defining characteristic is its guarantee of worst case
+linear time searches with respect to the size of the string being searched.
+
+Releases of the `regex` crate aren't normally announced on this blog, but
+since the majority of its internals have been rewritten in version 1.9, this
+announcement serves to encourage extra scrutiny towards any potential problems
+or regressions. If you run into any problems, please report them on the
+[issue tracker] or [ask questions on the Discussion forum][discussions].
+
+The only change to the API of the `regex` crate is the addition of a new
+[`Captures::extract`] method that should make dealing with capture groups
+in some cases more convenient. Otherwise, the main change folks should see is
+hopefully faster search times.
+
+You can read more in the [CHANGELOG] and in a more in depth blog post on
+[regex crate internals as a library][regex-internals].
+
+[issue tracker]: https://github.com/rust-lang/regex/issues
+[discussions]: https://github.com/rust-lang/regex/discussions
+[`Captures::extract`]: TODO
+[CHANGELOG]: TODO
+[regex-internals]: TODO