The meaning of `split(%r{\s*})`
<p><code>split(%r{\s*})</code> splits each letter ignoring spaces as in:</p>

<pre><code>"hi mom".split(%r{\s*}) # =&gt; ["h", "i", "m", "o", "m"]
</code></pre>

<p>Why can <code>%r{\s*}</code> work this way?</p>