Searching for a , and editing the contents of another

Searching for a , and editing the contents of another

I'm looking to write a piece of a larger program which I would like to
search the source html on a website for one of two values "Index 1" or
"Index 2" within a unknown number of tags, then edit the tag above the
containing "Index 1" or Index 2" (still within the same table row to
denote a checkbox is checked or unchecked. As an example: I want to
achieve all "Index 1" checkboxes on while "Index 2" checkboxes are off.
I'm not entirely sure the best way to approach this and am looking for
guidance in the right direction. Here is some mock code which may help
<fieldset class="stackedSection">
<legend >someThings</legend> <table>
<tr>
<td><input name="someId[]" type="checkbox" value="001"></input></td>
<td><a href="associated?id=001">nameOfAssociatedID001</a> index 1
(<a href="device?id=a01">name1</a>)</td>
</tr>
<tr>
<td><input name="someId[]" type="checkbox" value="002"
checked></input></td>
<td><a href="associated?id=002">nameOfAssociatedID002</a> index 1
(<a href="device?id=a02">name2</a>)</td>
</tr>
<tr>
<td><input name="someId[]" type="checkbox" value="003"
checked></input></td>
<td><a href="associated?id=003">nameOfAssociatedID003</a> index 1
(<a href="device?id=a03">name3</a>)</td>
</tr>
<tr>
<td><input name="someId[]" type="checkbox" value="004"
checked></input></td>
<td><a href="sensor?id=004"></a> index 2 (<a
href="device?id=a04">name4</a>)</td>
</tr>
</table>
</fieldset>