git pre commit hook - blocking added accents and bad characters

pre-commit

#!/bin/bash

echo "Checking your changes..."

#Whatever characters you want here, in the grep
if git diff --cached origin/stage *.html | grep -c 'é\|è\|ô' 
then
    echo "Impending doom shall be thy fate, o vilainous junior dev! Banish from thy work these monstrosities, or live to see thy kin demolished"
    exit 1

fi
echo "Well; thou hast not added horrid characters to thy code. Thou shalt live to see another day, o valorous developer"

chmod +x .git/hooks/pre-commit