#!/bin/bash
echo "Version: 4.4.0.157.165" | sed -E 's/.*Version: ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)\.[0-9]+/\1/'
sed -E 's/.*Version: ([0-9]+(\.[0-9]+){3})\.[0-9]+/\1/' <<< "Version: 4.4.0.157.165"