Remove pattern from array in Powershell

Question

$testing = @("a.txt", "b.txt")
$testing | Select-String???

I would like the output to only contain a, b. My real example is:

  $PackageNames = Get-ChildItem ("$DestinationPath\$ProjectName" + "_2105\" + $ProjectName) -Filter *.dtsx | Select-Object name -ExpandProperty name;

I need to use the content in this variable but without the extensions.

Are you really trying to remove file extensions? There's FileInfo class that has an attribute BaseName, which contains the file name without exension. If that's not your use case, edit the question and explain what kind of patterns you'd like to remove and keep. Can there be input such as ab.txt? Or a.doc? How should those be processed? — vonPryz
– vonPryz, Commented Sep 29, 2020 at 9:36

vonPryz · Accepted Answer · 2020-09-29 09:56:02Z

1

Working with files is easier, if you use FileInfo class' BaseName property. Like so,

$PackageNames = Get-ChildItem ("$DestinationPath\$ProjectName" + "_2105\" + $ProjectName) -Filter *.dtsx

# Process the results
foreach($pkg in $PackageNames) {
  $pkg.BaseName # Just prints the file name without extension
}

answered Sep 29, 2020 at 9:56

vonPryz

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2 Comments

xhr489 Over a year ago

Downvoted by mistake, so I should not use expandproperty?

vonPryz Over a year ago

@David Do not use ExpandProperty in this case. It converts object properties to strings. After such conversion the file object properties are lost, so you can't use, say, .FullName or .DirectoryName properties.

avarice · Accepted Answer · 2020-09-29 09:37:49Z

1

Try this:

$a|%{($_.tostring().split("."))[0]}

Iterate over the array, split by a dot and and get the first item.

answered Sep 29, 2020 at 9:37

avarice

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