searching for a word in message body

Hi,
I am trying to look up for a word in message body :
Example : look for word mac in message body.
          This should not pick up the words machine or bob-mac.

I tried :
:0 B
*\(mac\)
xyz

What am  I missing

Thank You

Dilip Vazirani
dvazirani(_at_)attmail(_dot_)com
(201) 564-3258