Using an array of wildcards in a Powershell WHERE clause - powershell

Question

I'm trying to make the following PowerShell script more generic. I want to pass in an array of excludes rather than a fixed list. I can't figure out how to do this except my partial solution below:
ORIGINAL
This gets all the files in a path except a list of wildcard files or folders:
Get-ChildItem -Path "$sitePath" -Recurse | `
where {!$_.PSIsContainer } | `
Select -ExpandProperty FullName | `
Where {$_ -notlike "$sitePath\Custom\*"} | `
Where {$_ -notlike "$sitePath\Download\*"} | `
Where {$_ -notlike "$sitePath\Temp\*"} | `
Where {$_ -notlike "$sitePath\Portal\*"} | `
Where {$_ -notlike "$sitePath\web.config*"} | `
SELECT $_
PARTIAL SOLUTION
This is the best I've come up with. It allows me to create an array of wildcards called $excludeList, but is limited and is slightly slower:
$excludeList = #("$sitePath\Custom\*",
"$sitePath\Download\*",
"$sitePath\Portal\*",
"$sitePath\web.config*")
Get-ChildItem -Path "$sitePath" -Recurse | `
where {!$_.PSIsContainer } | `
Select -ExpandProperty FullName | `
Where {$_ -notlike $excludeList[0]} | `
Where {$_ -notlike $excludeList[1]} | `
Where {$_ -notlike $excludeList[2]} | `
Where {$_ -notlike $excludeList[3]} | `
Where {$_ -notlike $excludeList[4]} | `
Where {$_ -notlike $excludeList[5]} | `
Where {$_ -notlike $excludeList[6]} | `
Where {$_ -notlike $excludeList[7]} | `
Where {$_ -notlike $excludeList[8]} | `
Where {$_ -notlike $excludeList[9]} | `
Where {$_ -notlike $excludeList[10]} | `
SELECT $_
Is there a better way to pass an array in to the where clause? All the solutions I've found only allow non-wildcard matches.
Hope someone can help!

Answer 1

One approach would be to iterate over the items in the exclude list, and only include a path if it does not match any of the exclusions:
$excludeList = #("$sitePath\Custom\*",
"$sitePath\Download\*",
"$sitePath\Portal\*",
"$sitePath\web.config*")
Get-ChildItem -Path "$sitePath" -Recurse |
where { !$_.PSIsContainer } |
select -ExpandProperty FullName |
where { $path = $_; -not #($excludeList | ? { $path -like $_ }) }
If all of your excluded items follow the same pattern, you can also simplify the exclude list by moving the common pattern to the like call:
$excludeList = #('Custom','Download','Portal','web.config')
Get-ChildItem -Path "$sitePath" -Recurse |
where { !$_.PSIsContainer } |
select -ExpandProperty FullName |
where { $path = $_; -not #($excludeList | ? { $path -like "$sitePath\$_*" }) }

Answer 2

If you're willing to go with a regex instead, you can simplify this a lot:
$excludeList = [regex]::Escape("$sitePath\Custom\"),
[regex]::Escape("$sitePath\Download\"),
[regex]::Escape("$sitePath\Temp\") -join "|"
Get-ChildItem $sitePath -Recurse | `
where {!$_.PSIsContainer } | `
Select -ExpandProperty FullName | `
Where {$_ -notmatch $excludeList}
Not sure why you have the trailing Select $_, it is unnecessary AFAICT.

Answer 3

You should try -contains and -notcontains operators if you are trying to compare against an array.
$array = "name1","name2","name3"
#This will return false
$array -contains "name"
#this will return true
$array -notcontains "name"