Add Splitting On Whitespace as a clojure til.

README.md

@@ -7,6 +7,10 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
+### clojure
+
+- [Splitting On Whitespace](clojure/splitting-on-whitespace.md)
+
 ### git
 
 - [Checkout Previous Branch](git/checkout-previous-branch.md)

clojure/splitting-on-whitespace.md

@@ -0,0 +1,34 @@
+# Splitting On Whitespace
+
+If you have a string with spaces and you want to split the string into a
+vector of strings (delimited by the spaces), then you can do something like
+this:
+
+```clojure
+(clojure.string/split "split me up" #" ")
+; ["split" "me" "up"]
+```
+
+However, if you have extra spaces in your string, the output may not be quite
+what you want:
+
+```clojure
+(clojure.string/split "double  spacing  wtf?" #" ")
+; ["double" "" "spacing" "" "wtf?"]
+```
+
+A quick fix might look like this:
+
+```clojure
+(clojure.string/split "double  spacing  wtf?" #"[ ]+")
+; ["double" "spacing" "wtf?"]
+```
+
+That's nice, but it is going to fall over as soon as we run into input with
+tabs and new lines. Assuming we want to split on all whitespace, we should
+tell our regular expression to do just that:
+
+```clojure
+(clojure.string/split "we\thave new\nlines and  tabs\n" #"[\s]+")
+; ["we" "have" "new" "lines" "and" "tabs"]
+```