Add support for regular expression delete in Rails 3 store.

[tristandunn]

This is needed due to expire_fragment not calling deleted_matched unless the key is a regular expression. See https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/caching/fragments.rb#L93-97

[letronje]

Was this merged ? Why was the pull request closed ?

[tristandunn]

It's almost a year old and I never received any feedback, so it was just cluttering up the pull request list. I was also initially confused, since master doesn't even contain the files I changed it seemed so old that it was absolute. I only just noticed that it would still apply to some of the branches.

[letronje]

your patch works for me locally if I modify gem source( 1.0.0.1 ). Any work-arounds or some other gem or project that I could use ?

[tristandunn]

I don't even remember what I was using this for now, but honestly it probably shouldn't be merged. There are lots of other regular expression specifics that can't be converted to be compatible with Redis, so it still doesn't allow you to easily switch between stores when using a RegExp. I think if you know you're going to use Redis you should just convert to a Redis compatible string, or if you really want this just monkey patch it.