parsing an Excel formula with the re module

Mensanator mensanator at
Tue Jan 5 20:05:32 CET 2010

On Jan 5, 12:35 pm, MRAB <pyt... at> wrote:
> vsoler wrote:
> > Hello,
> > I am acessing an Excel file by means of Win 32 COM technology.
> > For a given cell, I am able to read its formula. I want to make a map
> > of how cells reference one another, how different sheets reference one
> > another, how workbooks reference one another, etc.
> > Hence, I need to parse Excel formulas. Can I do it by means only of re
> > (regular expressions)?
> > I know that for simple formulas such as "=3*A7+5" it is indeed
> > possible. What about complex for formulas that include functions,
> > sheet names and possibly other *.xls files?
> > For example    "=Book1!A5+8" should be parsed into ["=","Book1", "!",
> > "A5","+","8"]
> > Can anybody help? Any suggestions?
> Do you mean "how" or do you really mean "whether", ie, get a list of the
> other cells that are referred to by a certain cell, for example,
> "=3*A7+5" should give ["A7"] and "=Book1!A5+8" should give ["Book1!A5]

Ok, although "Book1" would be the default name of a workbook, with
worksheets labeled "Sheet1". "Sheet2", etc.

If I had a worksheet named "Sheety" that wanted to reference a cell on
OF THE SAME WORKBOOK, it would be =Sheet2!A7. If the reference was to
a completely
different workbook (say Book1 with worksheets labeled "Sheet1",
"Sheet2") then
the cell might have =[Book1]Sheet1!A7.

And don't forget the $'s! You may see =[Book1]Sheet1!$A$7.

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