Scraping with Invoke-WebRequest - powershell

Question

We are migrating an asp.net intranet to SharePoint and automating the conversion via PowerShell.
We only want to scrap links from within the DIV tag with a classname 'topnav'. Not all the links on the page
$url = "http://intranet.company.com"
$page = Invoke-WebRequest -Uri $url
$div_topnav = $page.ParsedHtml.getElementsByTagName('div') | ? {$_.className -match 'topnav'}
This gets us the HTML of the topnav, but how best to extract just the application links from the Applications nodes? We do not want HOME or Documents nodes?
<div class="topnav" >
<ul class="lev1 clearfix" >
<li class="lev1 pos1 first lev1_first">
Home
</li>
<li class="lev1 pos2 haschildren lev1_haschildren">
Applications
<ul>
<li class="lev2 pos1 first lev2_first">
App 1
</li>
<li class="lev2 pos2 haschildren lev2_haschildren">
Training
<ul class="lev3">
<li class="lev3 pos1 lev3_pos1 first lev3_first">
App 3
</li>
<li class="lev3 pos2 lev3_pos2 last lev3_last">
App 4
</li>
</ul>
</li>
</ul>
<li class="lev1 pos3 haschildren lev1_haschildren">
Documents
<ul>
<li class="lev2 pos1 first lev2_first">
Doc 1
</li>
<li class="lev2 pos2 haschildren lev2_haschildren">
Training
<ul class="lev3">
<li class="lev3 pos1 lev3_pos1 first lev3_first">
Doc 3
</li>
<li class="lev3 pos2 lev3_pos2 last lev3_last">
Doc 4
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>

Answer 1

I think that is what you want:
[xml]$div_topnav=
#"<div class="topnav" >
<ul class="lev1 clearfix" >
<li class="lev1 pos1 first lev1_first">
Home
</li>
<li class="lev1 pos2 haschildren lev1_haschildren">
Applications
<ul>
<li class="lev2 pos1 first lev2_first">
App 1
</li>
<li class="lev2 pos2 haschildren lev2_haschildren">
Training
<ul class="lev3">
<li class="lev3 pos1 lev3_pos1 first lev3_first">
App 3
</li>
<li class="lev3 pos2 lev3_pos2 last lev3_last">
App 4
</li>
</ul>
</li>
</ul>
</li>
<li class="lev1 pos3 haschildren lev1_haschildren">
Documents
<ul>
<li class="lev2 pos1 first lev2_first">
Doc 1
</li>
<li class="lev2 pos2 haschildren lev2_haschildren">
Training
<ul class="lev3">
<li class="lev3 pos1 lev3_pos1 first lev3_first">
Doc 3
</li>
<li class="lev3 pos2 lev3_pos2 last lev3_last">
Doc 4
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
"#
($div_topnav.GetElementsByTagName("a") | ? "#Text" -Like "App *").href
The output will be your links of all of your apps.
PowerShell couldn't parse your posted $div_topnav Content, because there is a closing li-tag missing for your li-tag in line 6 (I fixed that in my Code snippet).