str_replace around a character??

Hello All, I am needing some assistance. I am trying to add some Cc and Bcc to a mail script I have. On the form I have instructions for each to be separated by a comma + a space. In an all perfect world each user would do this perfectly. ...but since were working with something different, how can I check for this? and catch any that dont do this perfectly? Is there a reg exp that covers this? I have seen many, but some make the head cramp. Mi mui novicio. To wrap it up, I am basically trying to do this... $cc = "email1@domain.com ,email2@doamin.com,email3@domain.com , email4@domain.com, " to be $cc = "email1@domain.com, email2@doamin.com, email3@domain.com, email4@domain.com" Any pointers would be much appreciated. TIA Best Regards, Karl DeSaulniers Design Drumm http://designdrumm.com