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Powershell grep -v

Still pretty new to powershell. I am looking to take the results of:

Get-ADPrincipalGroupMembership <user> | Select -Expand Name | Foreach-Object {$_.trim()}

and remove some of the Names that come back. On linux, I could grep -v for say Group1. I am not sure how to remove results from the list. There will be multiple results that I want to remove. So, for this example, lets use Group1 and Group2. Is there a way to do a powershell version of grep -v?
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stakor
Asked:
stakor
  • 2
1 Solution
 
QlemoDeveloperCommented:
Since we are not operating with string results but objects in PowerShell, you usually need to do it different. However, you've done string expansion here, so one way is
Get-ADPrincipalGroupMembership <user> |
  Select -Expand Name |
  Foreach-Object {$_.trim()} |
  Where-Object { 'Name1', 'Name2' -notcontains $_ }

Open in new window

With PS 3 and above, we can use the more straightforward -IN:
Get-ADPrincipalGroupMembership <user> |
  Select -Expand Name |
  Foreach-Object {$_.trim()} |
  Where-Object { $_ -notin 'Name1', 'Name2' }

Open in new window

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QlemoDeveloperCommented:
grep would translate to Select-String, if like to stay with something more similar:
Get-ADPrincipalGroupMembership <user> |
  Select -Expand Name |
  Foreach-Object {$_.trim()} |
  Select-String 'Name1', 'Name2' -NotMatch -SimpleMatch

Open in new window

This is more like fgrep -v because of -SimpleMatch, which stops using RegEx. Be aware that you would match any part of the name with that (as you do with *grep).
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