Comment 2 for bug 1702182

I believe horrible config editing practices are allowed (you can indent a line with spaces and it's still respected), so I might recommend a slightly more robust version:

 egrep -vr "^([[:space:]]*)?(#|$)" test.sudo | grep -i nopasswd || echo 'not found'

That's just a rough first draft, with the /etc/sudoers from RHEL7 copied and then I added this trash to it:

xyzzy ALL=(ALL) ALL
  xyzzy ALL=(ALL) ALL
  # xyzzy ALL=(ALL) ALL
  # xyzzy ALL=(ALL) NOPASSWD:ALL
 xyzzy ALL=(ALL) NOPASSWD:ALL
xyzzy ALL=(ALL) NOPASSWD:ALL

Tested:
$ visudo -c -f test.sudo
test.sudo: parsed OK

Here's just the left hand side of the egrep:

$ egrep -vr "^([[:space:]]*)?(#|$)" test.sudo
Defaults !visiblepw
Defaults always_set_home
Defaults env_reset
Defaults env_keep = "COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS"
Defaults env_keep += "MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE"
Defaults env_keep += "LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES"
Defaults env_keep += "LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE"
Defaults env_keep += "LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY"
Defaults secure_path = /sbin:/bin:/usr/sbin:/usr/bin
root ALL=(ALL) ALL
%wheel ALL=(ALL) ALL
xyzzy ALL=(ALL) ALL
  xyzzy ALL=(ALL) ALL
 xyzzy ALL=(ALL) NOPASSWD:ALL
xyzzy ALL=(ALL) NOPASSWD:ALL

Maybe do it backwards?

$ grep -ir nopasswd test.sudo | egrep -v "^([[:space:]]*)?(#|$)"
 xyzzy ALL=(ALL) NOPASSWD:ALL
xyzzy ALL=(ALL) NOPASSWD:ALL

...something like that?