Match everything except for specified strings

Question

I know that the following regex will match \"red\", \"green\", or \"blue\".

red|green|blue

Is there a straightforward way of making it mat

Answer 1

Matching Anything but Given Strings

If you want to match the entire string where you want to match everything but certain strings you can do it like this:

^(?!(red|green|blue)$).*$

This says, start the match from the beginning of the string where it cannot start and end with red, green, or blue and match anything else to the end of the string.

You can try it here: https://regex101.com/r/rMbYHz/2

Note that this only works with regex engines that support a negative lookahead.