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

I had the same question, the solutions proposed were almost working but they had some issue. In the end the regex I used is:

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

I tested it in Javascript and .NET.

.* should't be placed inside the negative lookahead like this: ^(?!.*red|green|blue) or it would make the first element behave different from the rest (i.e. "anotherred" wouldn't be matched while "anothergreen" would)