You can pick an obscure character and apply a don’t match character range with it ie
[^`]+. This is not true match any character though. Or you can try
[.\r\n]+ which doesn’t seem to work at all.
(?:\r|\n|.)+ works fine, but as you’ll find out soon, it is notoriously slow as each time you use it, you are creating a new 3 way branching point because of the brackets.
The perfect way I’ve found is actually a nicer variation of the first idea:
Which means ‘don’t match no characters’, a double negative that can re-read as ‘match any character’. Hacky, but works perfectly.