Return the regexp used for matching

[ex1st]

This is an attempt to return the functionality to build a routers tree for express app.
Developers can replace layer.regexp by layer.matchers[0].regexp in original code from @dougwilson expressjs/express#5858 (comment)

expressjs/express#5961

[blakeembrey]

While this can be added I’d rather not add it for this reason. I think you’d be better off describing what you actually want as a feature and working on getting that added officially, since that code feels like it could break any time the regex changes and I don’t understand how it would work properly for all the different features of path-to-regexp.

What is it you actually want from Express?

[ex1st]

Hi @blakeembrey, if pillarjs/router#123 will be merged, i will close it.

What is it you actually want from Express?

List of routes.