Calculator/1/1/1/1/1

It's time for those parts of quizzes that you always hate: where you have to find what's wrong with someone else's answer. {Oshwah tried the following regex to block all instances of the word "bad" from the mainspace. He tried the following regex:

He tried to add "bad" to an article, but the edit went through. There is exactly one character missing in this regex before it will work properly; what is it? - b - r - ; - c + i - m
 * type="" coef="5" }
 * You add an "i" in front of rlike to make it case insensitive. Anyway, this is the final level.