Powershell loop for excel replace - excel

Question

I have found a bit of code here on stack overflow, and added a few bits. It works like a charm with the current settings... On Sheet1 in the columns from A to D.
I would like it to run on all the sheets in the workbook. But I cant fold my brain around the a solotion that works.
This is my code that works on Sheet1:
$replacecount = 0
$file = "H:\test4.xlsx"
$Excel = New-Object -ComObject Excel.Application
$Excel.Visible = $false
$Workbook = $Excel.workbooks.open($file)
$SearchString = "2019-AUG"
$replacestring = "2020-MAY"
$Worksheet = $Workbook.Worksheets.Item(1)
$Range = $Worksheet.Range("A1:D1").EntireColumn
write-output $worksheet.index
$Search = $Range.find($SearchString)
if ($search -ne $null) {
$FirstAddress = $Search.Address
do {
$search.Value() = $Search.value() -Replace $SearchString, $replacestring
$search = $Range.FindNext($search)
$replacecount++
} while ($search -ne $null -and $search.Address -ne $FirstAddress)
}
Write-output "status Close"
Write-output $replacecount
$WorkBook.Save()
$WorkBook.Close()
I'm thinking that I should be using a FOREACH (sheet in worksheet) but when I try to set the range inside the loop I get an error

Answer 1

Consider looping through Excel's Sheets.Count property:
$num = $Workbook.Sheets.Count()
For ($i = 1; $i -le $num; $i++) {
write-host $Workbook.Worksheets.Item($i).Name
$Worksheet = $Workbook.Worksheets.Item($i)
$Range = $Worksheet.Range("A1:D1").EntireColumn
write-output $worksheet.index
$Search = $Range.find($SearchString)
if ($search -ne $null) {
$FirstAddress = $Search.Address
do {
$search.Value() = $Search.value() -Replace $SearchString, $replacestring
$search = $Range.FindNext($search)
$replacecount++
} while ($search -ne $null -and $search.Address -ne $FirstAddress)
}
}
Alternatively, directly loop on worksheets and not via sheet index with Item as #Theo comments:
foreach ($Worksheet in $Workbook.Worksheets){
write-host $Worksheet.Name
# $Worksheet = $Workbook.Worksheets.Item($i) REMOVE THIS ASSIGNMENT
...
}