Add Percent Notation as a ruby til.

README.md

@@ -98,6 +98,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Limit Split](ruby/limit-split.md)
 - [Override The Initial Sequence Value](ruby/override-the-initial-sequence-value.md)
 - [Parallel Bundle Install](ruby/parallel-bundle-install.md)
+- [Percent Notation](ruby/percent-notation.md)
 - [Squeeze Out The Extra Space](ruby/squeeze-out-the-extra-space.md)
 - [Summing Collections](ruby/summing-collections.md)
 

ruby/percent-notation.md

@@ -0,0 +1,33 @@
+# Percent Notation
+
+Ruby has many uses for the `%` character. One of the more obscure uses is as
+a notion for custom delimited strings. Use the percent notation with a
+non-alphanumeric character to surround a string.
+
+```ruby
+> %=Jurassic Park=
+=> "Jurassic Park"
+> % Ghostbusters  
+=> "Ghostbusters"
+```
+
+It even works with balanced characters
+
+> %(The Goonies)
+=> "The Goonies"
+
+This is useful for defining a string that has both types of quotes
+
+```ruby
+> %[That'll be the "day"]
+=> "That'll be the \"day\""
+```
+
+It's also useful for creating horribly obfuscated code
+
+```ruby
+> %=what===%?what?
+=> true
+```
+
+h/t [Josh Davey](https://twitter.com/joshuadavey/status/615613617099046912)