jQuery: Check for existence of BR as first or last element, including text nodes within a paragraph
<p>I wish to test in jQuery for the existence of a <code>&lt;br /></code> as the very first, or very last element (including text nodes) within a paragraph. The 2 examples below would be true:</p>

<pre>
<code>
&lt;p>
    &lt;br />
    Lorem ipsum dolor sit amet consectetur, adiscipling elit.
&lt;/p>
</code>
</pre>

<pre>
<code>
&lt;p>
    Lorem ipsum dolor sit amet consectetur, adiscipling elit.
    &lt;br />
&lt;/p>
</code>
</pre>

<p>While this example would be false:</p>

<pre>
<code>
&lt;!-- This is false -->
&lt;p>
    Lorem ipsum dolor sit amet consectetur, adiscipling elit
    &lt;br />
    Lorem ipsum dolor sit amet consectetur, adiscipling elit.
&lt;/p>
</code>
</pre>

<p>If true, the following <code>class</code>&rsquo;s of <code>diog-fail brbr</code> are to be applied to the containing paragraph element.</p>
