The article ID parser looks for a string at the end of a URL path with
a bunch of hex digits. But it also has to handle user, tag, and search
URLs.
* /@ba5eba11
* /tag/0ddba11
* /search?q=ba5eba11
Some URLs are encoded as params. The parser used to look at the result
of the path first, then the params. But paths that ended in
`global-identity-2` messed that up because `2` is a hex digit at the
end of the path. This changes the logic to parse params first and paths
second which gets around this.
Since the article ID regular expression wasn't anchored to the end of
the URL, it would grab characters after a / or - that were hex
characters. For example /@user/bacon-123abc would just grab `bac`. Not
great.
This anchors the ID at the end of the string so that it will be more
likely to catch IDs.
A new ArticleIdParser class takes in an HTTP::Request object and parses
the article ID from it. It intentinoally fails on tag, user, and search
pages and attempts to only catch articles.
