Sub WesternNumberToArabic_or_Persian()
Dim Rng As Range, StrTmp As String, i As Long
Set Rng = Selection.Range
With Selection.Range
  With .Find
    .ClearFormatting
    .Forward = True
    .Wrap = wdFindStop
    .Format = True
    .MatchCase = False
    .MatchWholeWord = False
    .MatchWildcards = True
    .MatchSoundsLike = False
    .MatchAllWordForms = False
    .Text = "[,.0-9]{1,}"
    .Replacement.Text = ""
  End With
  Do While .Find.Execute
    If .InRange(Rng) = False Then Exit Sub
    If .Characters.Last Like "[.,]" Then .End = .End - 1
    ' If the numbers are input right-to-left, use:
    StrTmp = Reverse(.Text)
    ' If the numbers are input left-to-right, use:
    StrTmp = .Text
    For i = 0 To 9
      ' For arabic #s, use
      StrTmp = Replace(StrTmp, Chr(48 + i), ChrW(17632 + i))
      ' For persian #s, use
      StrTmp = Replace(StrTmp, Chr(48 + i), ChrW(1776 + i))
    Next i
    .Text = StrTmp
    .Collapse (wdCollapseEnd)
  Loop
End With
End Sub

Sub Arabic_or_PersianNumberToWestern()
Dim Rng As Range, StrTmp As String, i As Long
Set Rng = Selection.Range
With Selection.Range
  With .Find
    .ClearFormatting
    .Forward = True
    .Wrap = wdFindStop
    .Format = True
    .MatchCase = False
    .MatchWholeWord = False
    .MatchWildcards = True
    .MatchSoundsLike = False
    .MatchAllWordForms = False
    'For arabic #s, use:
    .Text = "[,." & ChrW(1632) & "-" & ChrW(1641) & "]{1,}"
    'For persian #s, use
    .Text = "[,." & ChrW(1776) & "-" & ChrW(1785) & "]{1,}"
    .Replacement.Text = ""
  End With
  Do While .Find.Execute
    If .InRange(Rng) = False Then Exit Sub
    If .Characters.Last Like "[.,]" Then .End = .End - 1
    ' If the numbers are input right-to-left, use:
    StrTmp = Reverse(.Text)
    ' If the numbers are input left-to-right, use:
    StrTmp = .Text
    For i = 0 To 9
      ' For arabic #s, use 1632
      StrTmp = Replace(StrTmp, ChrW(1632 + i), Chr(48 + i))
      ' For persian #s, use 1776
      StrTmp = Replace(StrTmp, ChrW(1776 + i), Chr(48 + i))
    Next i
    .Text = StrTmp
    .Collapse (wdCollapseEnd)
  Loop
End With
End Sub

Function Reverse(StrTmp As String) As String
  If (Len(StrTmp) > 1) Then
    Reverse = Reverse(Mid$(StrTmp, 2)) + Left$(StrTmp, 1)
  Else
    Reverse = StrTmp
  End If
End Function