#!/bin/bash
s='VERSION="20.04.3 LTS (Focal Fossa)"'
awk 'match($0, /^VERSION="([^"]*)"/, m) {print m[1]}' <<< "$s"
sed -n '/^VERSION="\([^"]*\)".*/s//\1/p' <<< "$s"
IyEvYmluL2Jhc2gKcz0nVkVSU0lPTj0iMjAuMDQuMyBMVFMgKEZvY2FsIEZvc3NhKSInCmF3ayAnbWF0Y2goJDAsIC9eVkVSU0lPTj0iKFteIl0qKSIvLCBtKSB7cHJpbnQgbVsxXX0nIDw8PCAiJHMiCnNlZCAtbiAnL15WRVJTSU9OPSJcKFteIl0qXCkiLiovcy8vXDEvcCcgPDw8ICIkcyI=