Looking for a way, formula or macro, to search thru a cell and find
user account numbers within the text string of the cell. Once found, I
want to replace them with x's. This will basically be a 'scrub'
function to mask account numbers from view but keep the rest of the
cell's content intact. Here are some parameters:

1) each account number is 10 digits long, all numeric characters
2) ANY string within a cell that is 10 consecutive numeric characters
WILL be an account number
3) Account numbers are in no particular position within the cell. The
contents of the cell come from a chat log with customers, and they may
have typed the account number at any point in the string.

Once found, in each cell, I'd like to simply replace the numeric
characters with x's.

Any help is appreciated!

C