What is the PowerShell object name for a string?

Question

I have a simple REGEX method to obtain the last alphabetic characters of a string by removing letters and numbers which precede it:

"TEST02TEST" | %{($_ -Replace '\D*\d*(\w*)', '$1')}

the output for this is obviously TEST

What if I want to select it at the end of a pipeline? What do I call it, what is it's object name?

Basically I am trying to use add-member get both the refined string and the original string like this:

"TEST02TEST" | %{($_ -Replace '\D*\d*(\w*)', '$1') | Add-Member -MemberType NoteProperty -Name OriginalString -Value $_ -PassThru} | select OriginalString, (something here)

What is the "something here"?

Theo · Accepted Answer · 2020-04-18 12:16:14Z

3

Supposing you have a series of strings you need to tackle, like:

$strings = "TEST02TEST", "Blah123Something", "xyz0897654ABC"

you could do this:

foreach ($str in $strings) {
    $str | Select-Object @{Name = 'OriginalString'; Expression = {$_}},
                         @{Name = 'LastWordChars';  Expression = {$_ -replace '\D*\d*(\w+)', '$1'}}
}

Output:

OriginalString   LastWordChars
--------------   -------------
TEST02TEST       TEST
Blah123Something Something
xyz0897654ABC    ABC

Instead of @{Name = 'LastWordChars'; Expression = {$_ -replace '\D*\d*(\w+)', '$1'}} you could also use the regex -split operator:

@{Name = 'LastWordChars';  Expression = {($_ -split '\d+')[-1]}}

^{Of course, the property name 'LastWordChars' is totally up to you.}

answered Apr 18, 2020 at 12:16

Theo

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2 Comments

IanB Over a year ago

Thanks Theo - this is how that refactors: "TEST02TEST" | % {$_ | Select-Object @{Name = 'OriginalString'; Expression = {$_}}, @{Name = 'LastWordChars'; Expression = {$_ -replace '\D*\d*(\w+)', '$1'}}}

Theo Over a year ago

@IanB Yes, but on a single string "TEST02TEST" there is no need to do a ForEach-Object (aka %). This is the case when you are parsing an array of strings.

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