BoundedRegexp is like PlainRegexp, but ^ and $ anchors will automatically be added to the start and end of the regexp, respectively.

ConfigSet works similar to map[K]V in that it picks values of type V for keys of type K, but the keys in the data structure are actually regexes that can apply to an entire set of K instead of just one specific value of K.

PlainRegexp is a regex string that implements the Marshaler and Unmarshaler interfaces for encoding/json and gopkg.in/yaml.v2, respectively.