Show lines (and color) endings that violate the Greek final-n omission rule

wrong-greek-n-endings.sh

#!/bin/sh
#
# Show lines (and color) endings that violate the Greek final-n omission rule
# Exit with a 0 success error code if such lines were found
#
egrep -i  --color '\<(αυτήν|την|δεν|μην) ([^κπτξψαεηιουωάέήίόύώϊϋΐΰμνγ]|μ[^π]|ν[^τ]|γ[^κ])'