regexp problem

From: Karuna (karu_bs_at_yahoo.com)
Date: 10/17/03 

Date: 17 Oct 2003 00:02:45 -0700

Hi
If I want to validate certain IP Address range
say in an IP Address range of : "15.70.186.15-100",
here where 15.70.186 is the network id and 15-100 is
the host id. I want to discover all IP Addresses that
fall in between 15.86.70.15 - 15.70.186.100 .
what regexp do i need to use ?

regds
kbs