diff --git a/README.md b/README.md
index 91735e0..20c9d63 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_666 TILs and counting..._
+_667 TILs and counting..._
 
 ---
 
@@ -523,6 +523,7 @@ _666 TILs and counting..._
 - [Last Raised Exception In The Call Stack](ruby/last-raised-exception-in-the-call-stack.md)
 - [Limit Split](ruby/limit-split.md)
 - [Listing Local Variables](ruby/listing-local-variables.md)
+- [Mocking Requests With Partial URIs Using Regex](ruby/mocking-requests-with-partial-uris-using-regex.md)
 - [Navigate Back In The Browser With Capybara](ruby/navigate-back-in-the-browser-with-capybara.md)
 - [Next And Previous Floats](ruby/next-and-previous-floats.md)
 - [Or Operator Precedence](ruby/or-operator-precedence.md)
diff --git a/ruby/mocking-requests-with-partial-uris-using-regex.md b/ruby/mocking-requests-with-partial-uris-using-regex.md
new file mode 100644
index 0000000..acf02ae
--- /dev/null
+++ b/ruby/mocking-requests-with-partial-uris-using-regex.md
@@ -0,0 +1,21 @@
+# Mocking Requests With Partial URIs Using Regex
+
+Generally when mocking out requests with the
+[webmock](https://github.com/bblimke/webmock) gem, we specify full request
+URIs like so:
+
+```ruby
+stub_request(:post, 'http://localhost:4000/api/posts')
+```
+
+We may not want to specify the entire URI though. For instance, the host may
+change or be configurable. The `stub_request` method allows us to use regex.
+
+```ruby
+stub_request(:post, %r|/api/posts|)
+```
+
+Using the `%r` regex literal syntax, we are able to avoid escaping all of
+the `/` characters in our URI.
+
+h/t Brian Dunn