#!/bin/bash
s='a-b-c.a.enabled.xxx.xx
a-b-c.a.b.enabled.xxx.xx
a-b-c.enabled.xxx.xx'
awk -F. '$2 == "enabled"{print $1}' <<< "$s"

sed -n 's/^\([^.]*\)\.enabled.*/\1/p' <<< "$s"