Overall I give the PR a big ole' hearty :thumbsup: 

Only comment I have is with how we could more succinctly describe what's going on here. `regex` is too generic to know at first glance what the regex actually *is*.  Actually all regex's are impossible to tell wtf is going on - who am I kidding.

What do you think about extracting the above into a more intention revealing private method like `reply_delimeter_regex`?

```ruby
private 

def reply_delimeter_regex
  delimiter = Array(Griddler.configuration.reply_delimiter).join('|')
  %r{#{delimiter}}
end
```

Just riffing.  @r38y what do you think? Am I daft? From someone coming in and looking at this on a first pass I'm just left having to parse and grok what exactly is going on here.  By the way - your new spec descriptions definitely help. I like.