Support partially dynamic segments

[brandoncc]

What it is

Adds matching for dynamic portions of a segment. This is in addition to the current dynamic matching which matches only entire segments.

Why

Currently, "cats.tenderlove-bio.name" would be marked unused even if the source code contains t "cats.#{cat}-bio.name".

Closes #508

How

The library uses two special characters in regex matches right now: * and :. I combined these characters to create a "lazy match" similar the the way you combine .+ and ? to lazily match in standard regular expressions.

I created tests which verify that the partial match is only done in a single segment, rather than matching across segments.

Since there isn't currently a way to change which replacement string is used from ":", I changed the default value to the new "*:".

Questions

• What are the repercussions of changing the default replacement value?
  • In particular, I don't know if this has any negative repercussions on this line and other lines that use this variable.
• Is this likely to have any negative effects on existing users of the library?
  • I think it might be a good idea to introduce an "opt-in" option in the configuration so that existing users don't see a change in behavior. This option could become the default in a future version. Alternatively, this PR could be a breaking change and therefore warrant a major version bump according to semver.

[glebm]

Thanks!