regex with grep

The trick with using regex with grep is that no // slashes are needed, you simply quote the text and use regex controls.

ie: something like this would list everyline ending in exactly no

grep '^.* no$' sshd_config 

However, for the same task, this would be more helpful...

grep '^[^#].* no$' sshd_config

As it excludes the leading # (comment)