Hi I want to check if the prevoius char is a :. The exact example code I have is this:

Prefix: !

I want basicly to be able to check based on if the previous char is a : the ! should get a string and later reuse the look back logic to check if I am inside an array which is defined like in yaml meaning to make sure the last 2 lines of the following example don't get into the ar

I stumbled upon csly and we should benchmark against it.