From the perspective of the filter is it working like intended. The word sex is in there, if any character can be used as a whitespace. They limit the such char

From the perspective of the filter is it working like intended. The word sex is in there, if any character can be used as a whitespace. They limit the such characters, but then you would use dirty words with underscores or punctuators, which would get through. Therefore such filter for words in useless and impossible to make accurate enough.