add Replacing HTML tags with HTML named entities

Author: phlipper

chapters/regular_expressions/replacing-html-tags-with-html-named-entities.md

@@ -0,0 +1,25 @@
+---
+layout: recipe
+title: Replacing HTML tags with HTML named entities
+chapter: Regular Expressions
+---
+## Problem
+
+You need to replace HTML tags with named entities:
+
+`<br/> => &lt;br/&gt;`
+
+## Solution
+
+{% highlight coffeescript %}
+htmlEncode = (str) ->
+  str.replace /[&<>"']/g, ($0) ->
+    "&" + {"&":"amp", "<":"lt", ">":"gt", '"':"quot", "'":"#39"}[$0] + ";"
+
+htmlEncode('<a href="http://bn.com">Barnes & Noble</a>')
+# => '&lt;a href=&quot;http://bn.com&quot;&gt;Barnes &amp; Noble&lt;/a&gt;'
+{% endhighlight %}
+
+## Discussion
+
+There are probably better ways to implement the above method.

wanted-recipes.md

@@ -87,7 +87,6 @@ foo 1, 2, 3
 * Searching for substrings # "foo bar baz".match(/ba./) # => [ 'bar', index: 4, input: 'foo bar baz' ]
 * Searching for substrings # "foo bar baz".search(/ba./) # => 4
 * Replacing substrings # "foo bar baz".replace( /ba./, 'foo') # => "foo foo baz"
-* Replace HTML tags with named HTML entities # <br/> => &lt;br/&gt;
 
 ## Networking