#!/bin/sed -nf
/class="res"/{
  s/[^>]*<a href="\([^"]*\)"[ \t]*class="res">[^<>]*<\/a>[^<]*/\1\n/g
  s/[^>]*<a class="res"[ \t]*href="\([^"]*\)">[^<>]*<\/a>[^<]*/\1\n/g
  s/^\n//p
  s/\n$//p
}