Remove list of phrases if they are present in a text file using Powershell - powershell

Question

I'm trying to use a list of phrases (over 100) which I want to be removed from a text file (products.txt) which has lines of text inside it (they are tab separated / new line each). So that the results which do not match the list of phrases will be re-written in the current file.
#cd .\Desktop\
$productlist = #(
'example',
'juicebox',
'telephone',
'keyboard',
'manymore')
foreach ($product in $productlist) {
get-childitem products.txt | Select-String -Pattern $product -NotMatch | foreach {$_.line} | Out-File -FilePath .\products.txt
}
The above code does not remove the words listed in the $productlist, it simply outputs all links in products.txt again.
The lines inside of products.txt file are these:
productcatalog
product1example
juicebox038
telephoneiphone
telephoneandroid
randomitem
logitech
coffeetable
razer
Thank you for your help.

Answer 1

Here's my solution. You need the parentheses otherwise the input file will be in use when trying to write to the file. Select-string accepts an array of patterns. I wish I could pipe 'path' to set-content but it doesn't work.
$productlist = 'example', 'juicebox', 'telephone', 'keyboard', 'manymore'
(Select-String $productlist products.txt -NotMatch) | % line |
set-content products.txt

Answer 2

here's one way to do what you want. it's somewhat more direct than what yo used. [grin] it uses the way that PoSh can act on an entire collection when it is on the LEFT side of an operator.
what it does ...
fakes reading in a text file
when ready to do this in real life, replace the whole #region/#endregion block with a call to Get-Content.
builds the exclude list
converts that into a regex OR pattern
filters out the items that match the unwanted list
shows that resulting list
the code ...
#region >>> fake reading in a text file
# when ready to do this for real, replace the whole "#region/#endregion" block with a call to Get-Content
$ProductList = #'
productcatalog
product1example
juicebox038
telephoneiphone
telephoneandroid
randomitem
logitech
coffeetable
razer
'# -split [System.Environment]::NewLine
#endregion >>> fake reading in a text file
$ExcludedProductList = #(
'example'
'juicebox'
'telephone'
'keyboard'
'manymore'
)
$EPL_Regex = $ExcludedProductList -join '|'
$RemainingProductList = $ProductList -notmatch $EPL_Regex
$RemainingProductList
output ...
productcatalog
randomitem
logitech
coffeetable
razer