Extract Text From Variable

I have a variable called HTMLSource that contains the entire source code of a webpage. Within the code are snippets like this:

<tr>
<td>Last Name<br>

<table class="inactiveTextTable"><tr><td >Doe  </td></tr></table>

</td>

<td> </td>
<td>First Name<br>

<table class="inactiveTextTable"><tr><td >John  </td></tr></table>

</td>

How do I extract the name (i.e.John Doe) from all this HTML garbage around it? Please keep in mind that the name will change but the format will be the same.Also I need some way of knowing that the value I'm pulling (i.e.Doe) is his last name and not his first name.

<td> </td>
<td>My Color<br>
<input type="text" name="color" size="6" value="red" class="colInputBox" tabindex="4">
</td>