Help with regular expressions.

I've a BoundColumn in a datagrid, mapping a "money" column in a SQL
It shows like this: 12600.0000
I just want to show the int part (ie: 12600).
I've tried giving a Data Formatting Expresion in the datagrid (with the DataFormatString= property)
I've tried with DataFormatString="/d" DataFormatString="/d{*,0}" but it gives me an error

Do someone know how can I format a regularexpression that shows me just the integer part of the decimal number?

Thanks in advance!