find . -type f -iname '*.Gbx' -print0 |
    while IFS= read -r -d $'\0' file; do
        title=$(grep -aPo 'title="(.*?)"' "$file" | sed -r 's/.*?="(.*)"/\1/g')
        titledir="repack/$title"
        if [ ! -d $titledir ]; then
            mkdir -vp $titledir
        fi
        filename=$(basename "$file")
        cp -v "$file" "$titledir/$filename"
    done