Powershell contains - match on partial string and list?

Question

I have this situation in my script:

$Excludes = "Commvault","Veeam"

$testuser = 'DOMAIN\vCommvaultConnect'
$Excludes | ForEach-Object {
    If ($testuser.Contains($_)) {
    Write-Host "Found"
    }
}

Is this the most efficient way to test for this or is there a faster way to match a user to each of those excluded words?

Karthick Ganesan · Accepted Answer · 2020-03-13 09:45:52Z

1

How about this, using Regex search groups

$Excludes = "Commvault","Veeam"

$SearchRegex_Excludes = ($Excludes | % { "(" + ($_) + ")" }) -join "|"
# sample regex pattern result - (Commvault)|(Veeam)

$testuser = "DOMAIN\vCommvaultConnect"

if ( $testuser -match $SearchRegex_Excludes ) { "Found" } else { "Not Found " }

answered Mar 13, 2020 at 9:45

Karthick Ganesan

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4 Comments

Olaf Over a year ago

Is this more efficient or faster than the original? If yes - why?

Scepticalist Over a year ago

It's both, Just use measure-command on both. Thanks Karthick, this is what I was trying to remmeber how to do. The excludes variable is only used for this, so I can define it as a Regex group anyway: $Excludes = "Commvault|Veeam"

Olaf Over a year ago

I did measure. OK. If that difference is what matters for you. ;-)

Matthew Over a year ago

Can you explain why this is more efficient?

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