how can i find all lines in text file, which do not(!) fit this pattern:

`xxx-xx-xxx.xxx` 

(no matter the lenght of each part; 'x' can be any char)

i can find lines with this pattern by searching the regular expression `^(.*-.*-.*\.+.*)$` (using EmEditor),

but i couldnt find a way to find the negative case.

thanks!