Symfony version(s) affected: 4.1.1

Description
We have a URL with a variable that will contain a dot, but that doesn't work under Symfony 4.1.1 any more when there is another route that has a host requirement set.

How to reproduce

1. Put the following in routes.yaml:

foo:
  path: /foo
  host: 'foo.example.com'
  controller: foo_controller

bar:
  path: /bar/{baz}
  controller: baz_controller

2. Try to visit /bar/abc.123

When you remove host: 'foo.example.com' from the foo route it does work.