Huh - that’s confusing in the context of this example, but indeed tests fine on my system (nvi).
Since the “word” in question is “<div>”, I thought the \< was just an escape. I looked in various docs and the best I see in Tcl re_syntax(n) is \< and \> are synonyms for [[:<:]] and [[:>:]] respectively, which are constraints matching empty strings at the beginning and end of words, where a word a sequence of word characters... [a-zA-Z0-9_]
