question about plpgsql replace function

Hi,
I have a text field that has some email addresses that are each on a new
line by a CRLF.

I want to replace the CRLF with  a comma so I can use the email
addresses in another app, so I thought I would do this:

thearray = replace(mandi_notifications,'/r/n',',');

but it does not work.

Does anyone know if it is possible to replace a CRLF in a string with PG
built in functions?  I would rather not use Perl if possible.

Thanks,

Tony