Remove few lines from file by means of powershell - powershell

Question

If I want to remove from document lines with some string key ("foo" for example) I use this:
$content = Get-Content 'C:/fake.txt' | Where-Object {$_ -notmatch 'foo'}
$content | Out-File 'C:/fake.txt'
But now I have file with this scheme:
...
<data name="BLABLA" xml:space="preserve">
<value>some data here</value>
</data>
...
<data name="BLABLA22" xml:space="preserve">
<value>some data</value>
<comment>some comment</comment>
</data>
And I need to remove for key "BLABLA" this three lines
<data name="BLABLA" xml:space="preserve">
<value>some data here</value>
</data>
And for key "BLABLA2" this four lines
<data name="BLABLA22" xml:space="preserve">
<value>some data</value>
<comment>some comment</comment>
</data>
How can I do this by means of powershell?

Answer 1

If you want to delete the complete node, then the following should get you there.
# load the file into xml
[xml]$dom = gc file.xml
# find the node
$nod = $dom.SelectSingleNode("/root/data[#name='BLABLA']")
# remove the node from the parent
$nod.ParentNode.RemoveChild($nod)
# save the xml
$dom.save("file.xml")
I've assumed your data looks a bit like this:
<root>
<data name="BLABLA" xml:space="preserve">
<value>some data here</value>
</data>
<data name="BLABLA22" xml:space="preserve">
<value>some data</value>
<comment>some comment</comment>
</data>
</root>