Path-to-RegExp

The path argument is used to define parameters and populate keys. The RegExp returned by path-to-regexp is intended for ordered data (e.g. pathnames, hostnames). It can not handle arbitrarily ordered data (e.g. query strings, URL fragments, JSON, etc). When using paths that contain query strings, you need to escape the question mark (?) to ensure it does not flag the parameter as optional. Backslashes need to be escaped with another backslash in JavaScript strings. It is possible to write an unnamed parameter that only consists of a regexp. It works the same the named parameter, except it will be numerically indexed. When dealing with query strings, escape the question mark (?) so it doesn't mark the parameter as optional. Handling unordered data is outside the scope of this library. Parameters can be suffixed with an asterisk (*) to denote a zero or more parameter matches.