masking column output

Summary:

I need to be able to mask the output of a column with an email address in it, in a B2C report. Some of the emai lshould show - but a couple of chars either side of the @ sign should show as **

Content (required):

As above - I need to be able to mask the output of a column with an email address in it, in a B2C report. Some of the emai lshould show - but a couple of chars either side of the @ sign should show as **

Can this be done, and if s ocan someone please post an example URGENTLY. I have a client who will not wait more than a couple fo days for a result