hex value in condition

I want to specify hexadecimal value of for example "cad6bfae"
which stands for "reply" in Japanese EUC code 
as value for condition line.

:0
* B ?? .*\/_hex_here_
  { 
    :0
    | echo "$MATCH" > henshin
  } 
  
If possible, how do I specify?

_/_/_/      Mitsuru FURUKAWA      _/_/_/
_/_/_/        Tokyo, Japan        _/_/_/
_/_/_/     mailto:furu(_at_)009(_dot_)com    _/_/_/
_/_/_/  http://www.009.com/furu/  _/_/_/