what are the limitations on regex for word mutes?

bunnybeam

what are the limitations on regex for word mutes? i tried to do a negative lookahead but sharkey rejected it

bunnybeam

so like. let's say i particularly don't want to see the word "test" or any unexpected variation of it ("retest", "testing", any word i didn't predict that has "test" in it)

but im fine with "testosterone" so i want to make an exception for that

i believe i would do /test(?!osterone)/i right? but it says that's an invalid regex expression

i guess i could do /test\b/i and /test[^o]/i; that should work as long as the word doesn't happen to have "testo" in it