I am trying to ignore lines in a cisco config file with a single "!"

these are the regex that i have tried:
^!
^"!"
^'!'
Even tried ignoring all commented lines:
>!
but when comparing startup and running configs, they all fail saying that there is a difference,
can anyone point me in the right direction ?
(We are running NCM V6 with NPM V10)
Best regards
Claus Hansen