Apostrophes ignored in blacklist

[splorp]

This needs testing, but it appears that some strings which include apostrophes may not get applied by the blacklist.

For example, the term '' (a pair of serial apostrophes) did not catch a comment which included the phrase we''ve.

With further testing, it looks like "" (a pair of serial straight quotes) will not work either.

Wondering if this has something to do with the wptexturize() function? Comment text that includes straight quotes will appear correct in edit mode, but has smart quotes applied when previewed.