not like perl..

I have a simple table with a varchar(32) field that I am trying to
extract data using regular expressions.

select * from spam where inetaddr like '100.%'
row | inetaddr | tdate
------+--------------+---------------------------
3245 | 100.81.98.51 | 03/08/2011 07:21:19.29209 -----works fine

select * from spam where inetaddr like E'\d\d\d.%'
row | inetaddr | tdate
-----+----------+-------
(0
rows)
--- zip ???????????

slect * from spam where inetaddr like E'\d.%'
row | inetaddr | tdate
-------+--------------------------------+----------------------------
49424 | d(dot)russell_ul(at)jdmarketing(dot)co(dot)uk | 03/27/2011 15:46:41.110566
??????????? though \d was a digit match????

select * from spam where inetaddr like E'\\d.%'
row | inetaddr | tdate
-------+--------------------------------+----------------------------
49424 | d(dot)russell_ul(at)jdmarketing(dot)co(dot)uk | 03/27/2011 15:46:41.110566
???????????

What am I doing wrong???

thanks

hook(at)lota(dot)us