Trim() Method not working inside double quotes-CodePudding

If I have a string like so:

$String = "Hello      world"

and attempt to prefix another string into it by:

$String | % {"Page 1   = ($_.trim())"}

I get back:

Page 1   = (Hello      world.trim())

I have tried a few other variations, the only one that worked is:

$String | % {($_.trim())}

Which is not ideal, as I need to prefix a string to multiple lines of text files. Any help would be appreciated

CodePudding user response：

You're looking to invoke an expression embedded in a string, that's exactly what the Subexpression Operator $( ) is for. As aside, your .Trim() wouldn't do anything on that example string because it can only trim exceeding leading or trailing whitespace.

If your string looked like this then Trim() would be perfect:

$String = "   Hello World   "
$String | ForEach-Object { "Page 1   = $($_.Trim()')" }

However, it seems you actually want to remove the exceeding white space from the middle of the string, in that case you can use -replace:

$String = "Hello     World"
$String | ForEach-Object { "Page 1   = $($_ -replace '\s')" }
# if you want to leave a white space in the middle
$String | ForEach-Object { "Page 1   = $($_ -replace '\s ', ' ')" }