The download links for facebooks 533m user account leak header:
mobilenumber:userid:firstname:lastname:gender:residence:birthplace:relationship:workplace:joined:email:birthdate
How I search data:
grep -Ri ./USA -e "firstname:lastname"
I suggest you to fix this a little, Because the joined date is in this format: 5/8/2018 12:00:00 AM
and the separate char is : too, it can break some things up
sed -i -r 's/ [0-9]{2}:[0-9]{2}:[0-9]{2} AM//g' Hungary.txt