How can I convert currency strings to numerical values?

Question

Is there a way to convert currency strings to floating values, for example:

$1,138.15
$ 29.10
$2,195.34

Should be converted to:

1138.15
29.10
2195.34

Some currency strings have space between the dollar sign and the dollar value.

I am doing this because I am extracting the cost values from PDFs (which are converted to txt files) and do arithmetic on them. For example, a portion of text file looks like this:

Fixed Power

$1,138.15

General Admin Surcharge

$ 29.10

Customer Charge

$2,195.34

And my code looks like this:

$sourceFile = Get-Content $sourcePath\$($filenames[0]).txt

$fixedPower = $sourceFile[(
    Select-String `
        -Path $sourcePath\$($filenames[0]).txt `
        -Pattern "Fixed Power" `
        -List
).LineNumber + 1]

$generalAdminSurcharge = $sourceFile[(
    Select-String `
        -Path $sourcePath\$($filenames[0]).txt `
        -Pattern "General Admin Surcharge" `
        -List
).LineNumber + 1]

$customerCharge = $sourceFile[(
    Select-String `
        -Path $sourcePath\$($filenames[0]).txt `
        -Pattern "Customer Charge" `
        -List
).LineNumber + 1]

But those only extract the costs into string values.

Answer 1

$Test = '$1,138.15','$ 29.10','$2,195.34'

$Test |
 foreach { $_ -replace '[^0-9.]'}


1138.15
29.10
2195.34

If you want the trailing 0 you'll have to leave it as [string] until you do whaterver calculations you want with it.

Answer 2

You could do a Replace to remove whatever extra things you want gone from the string, and then cast it as a [decimal]

[decimal]$customerCharge = $customerCharge -replace "(\$| |,)"

Edit: Of coarse mjolinor beat me to it, and did it better. Man he's good!