Regular expression substring replacement in Microsoft Excel [closed]

Answer 1

Use Excel VBA. Make a reference to "Microsoft VBScript Regular Expressions 5.5".

Then do, in a new regular VBA module:

Sub ReplaceMobileNumbers
  Dim re as New RegExp

  re.Pattern = "^0(?=7[0-9]{9}$)"   ''# look-ahead

  Dim cell As Range
  For Each cell In ActiveSheet.Range("Your Range Address in A1:B1 notation")
   cell.Value = re.Replace(cell.value, "44")
  Next cell
End Sub

and call this sub in the Immediate Window. The above is throw-away code, not designed with re-usability in mind. I know that, so don't tell me. ;-)

Though you can probably get away with a cell function:

=IF(AND(LEN(A1) = 11;LEFT(A1; 2) = "07"); "44" & RIGHT(A1; 10); A1)