Replace strings in text files with string literals and file names in powershell - string

Question

My google-fu has failed me, so I'd love to get some help with this issue. I have a directory full of markup files (extension .xft). I need to modify these files by adding string literals and the filename (without the file extension) to each file.
For example, I currently have:
<headerTag>
<otherTag>Some text here </otherTag>
<finalTag> More text </finalTag>
What I need to end up with is:
<modifiedHeaderTag>
<secondTag> filenameGoesHere </secondTag>
<otherTag>Some text here </otherTag>
<finalTag> More text </finalTag>
So in this example,
"<modifiedHeaderTag>
<secondTag>"
would be my first string literal (this is a constant that gets inserted into each file in the same place),
filenameGoesHere
would be the variable string (the name of each file) and,
"</secondTag>"
would be my second constant string literal.
I was able to successfully replace text using:
(Get-Content *.xft).Replace("<headerTag>", "<modifiedHeaderTag>")
However, when I tried
(Get-Content *.xft).Replace("<headerTag>", "<modifiedHeaderTag> `n
<secondTag> $($_.Name) </secondTag>")
I just got an error message. Replacing $($_.Name) with ${$_.Name) also had no effect.
I've tried other things, but this method was the closest that I had gotten to success. I would appreciate any help that I can get. It's probably simple and I'm just not seeing something due to inexperience with Powershell, so a helping hand would be great.
If the above isn't clear enough, I'd be happy to provide more info, just let me know. Thanks everyone!

Answer 1

Here's my approach, assuming you have all of the XFT's in one folder and you want to write the updates back to the same file:
$path = "C:\XFTs_to_Modify"
$xfts = Get-ChildItem $path -Include "*.xft"
foreach ($xft in $xfts) {
$replace = "<modifiedHeaderTag>
<secondTag> $($xft.Name) </secondTag>"
(Get-Content *.xft).Replace("<headerTag>", $replace) | Set-Content $xft.FullName -Force
}