Looks all wrong to me. "don’t" is a contraction of two words, it is not one word.
English is taught as that squiggle being punctuation, not a letter. (Unlike, say, the Hawaiʻian ʻOkina <http://en.wikipedia.org/wiki/%CA%BBOkina>.) You can't use simple regular expressions to find word boundaries. That's why we have UAX #29. Confusion between apostrophe and quoting -- blame the scribe who came up with the ambiguous use, not the people who gave it a number. If anything, Unicode might have made a mistake in encoding two of these that look identical. How are normal users supposed to find both U+2019 and U+02BC on their keyboards, and how are they supposed to deal with incorrect usage? markus