find files matching either some string or some other string in bash

Question

I wonder how to specify to the command find for searching files with names matching some string or some other string.

For example, if I want to look for files that match either *dat or *txt under current directory, how to specify?

Thanks and regards!

Answer 1

find . \( -name \*.dat -o -name \*.txt \)

Answer 2

find /path -type f \( -iname "*.txt" -o -iname "*.dat" \)