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	diff --git a/lib/tesla/middleware/path_params.ex b/lib/tesla/middleware/path_params.ex
	index 60d012f..0e7e28b 100644
	--- a/lib/tesla/middleware/path_params.ex
	+++ b/lib/tesla/middleware/path_params.ex
	@@ -1,42 +1,42 @@
	defmodule Tesla.Middleware.PathParams do
	@moduledoc """
	Use templated URLs with separate params.

	Useful when logging or reporting metric per URL.

	## Example usage

	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.BaseURl, "https://api.example.com"
	plug Tesla.Middleware.Logger # or some monitoring middleware
	plug Tesla.Middleware.PathParams

	def user(id) do
	params = [id: id]
	get("/users/:id", opts: [path_params: params])
	end
	end
	```
	"""

	@behaviour Tesla.Middleware

	- @rx ~r/:([\w_]+)/
	+ @rx ~r/:([a-zA-Z_]+)/

	@impl Tesla.Middleware
	def call(env, next, _) do
	url = build_url(env.url, env.opts[:path_params])
	Tesla.run(%{env \| url: url}, next)
	end

	defp build_url(url, nil), do: url

	defp build_url(url, params) do
	Regex.replace(@rx, url, fn match, key ->
	to_string(params[String.to_existing_atom(key)] \|\| match)
	end)
	end
	end