regular expression in html code

Hi all,

I want to use Regular Expression to extract info from html code.
This is my html code :

<body>
.....
<tr class="fiveday-temps">
<td>a <div>a1</div></td>
<td>b <div>a2</div></td>
<td>c <div>a3</div></td>
<td>d <div>a4</div></td>
<td>e <div>a5</div></td>
</tr>
.....
</body>

How to write code to get a,b,c,d,e value and set its into array?
How to write code to get a1,b1,c1,d1,e1 value and set its into array?
Thanks very much
...