Remove white spaces in a single column - vba

Question

I have a sheet that I need to remove the spaces from so I can compare it I am using a function I found on here and a sub that puts all the values into an array (for speed) but I cannot get it to work any idea why. I get a
ByRef argument type mismatch error
Public Function RemoveWhiteSpace(target As String) As String
With New RegExp
.Pattern = "\s"
.MultiLine = True
.Global = True
RemoveWhiteSpace = .Replace(target, vbNullString)
End With
End Function
Sub stringRangeToClean()
Dim r As Variant
Dim i As Long
r = ActiveWorkbook.Sheets("Trent BASE DATA").UsedRange
For i = 2 To UBound(r)
r(i, 10).Value2 = RemoveWhiteSpace(r(i, 10))
Next i
End Sub
now trying this have I realised the col I is actually (I,9)
but im getting an error user defined type error on the RegExp line
Public Function RemoveWhiteSpace(target As String) As String
With New RegExp
.Pattern = "\s"
.MultiLine = True
.Global = True
RemoveWhiteSpace = .Replace(target, vbNullString)
End With
End Function
Sub stringRangeToClean()
Dim r As Variant
Dim i As Long
Dim txt As String
r = ActiveWorkbook.Sheets("Trent BASE DATA").UsedRange
For i = 2 To UBound(r)
txt = r(i, 9)
txt = RemoveWhiteSpace(txt)
Next i
End Sub

Answer 1

Here you go, no regex required for simply removing spaces. Your main challenge is just defining your range which is basic VBA:
Sub tgr()
With ActiveWorkbook.Sheets("Trent BASE DATA")
.Range("J2", .Cells(.Rows.Count, "J").End(xlUp)).Replace " ", vbNullString
End With
End Sub

Answer 2

Try like this:
Public Function RemoveWhiteSpace(target As String) As String
Dim RegExp As Object
Set RegExp = CreateObject("VBScript.RegExp")
With RegExp
.Pattern = "\s"
.MultiLine = True
.Global = True
RemoveWhiteSpace = .Replace(target, vbNullString)
End With
End Function
This way you are using a late binding for the regExp variable, thus neither you nor your users have to add any additional library.
If you want to use the early binding, you should add the Microsoft VBScript Regular Expressions 5.5" library to the ones, that VBA uses. The early binding gives you some time bonus and it provides IntelliSense.
Here the selected answer explains step-by-step how to add the library:
How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
Concerning your code - this is very simply loop, try to do it:
Sub StringRangeToClean()
Dim r As Variant
Dim myCell As Range
r = ActiveWorkbook.Sheets("Trent BASE DATA").UsedRange
For Each myCell In r
myCell = RemoveWhiteSpace(txt)
Next myCell
End Sub
This way every cell would be examined and the white spaces would be removed.