VS 2012 Get exact number from string

Hi all,

I have a number of rows in a datagridview that i want to go through and get the string.
The string will consist of letters, numbers and punctuation.
But all will have a eight digit number beginning with the number 9
i.e 91234567

Some strings might contains two or more of a number like this.

What i need is to be able to extract just this number
and (if possible) if there is two or more duplicate the datagridview row for each extra number.

Can someone help me out here.

Thanks in advance
Alex