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Martin v. Löwis <report@bugs.python.org> wrote
 on 2011年10月01日 10:59:48 -0000: 
>> * Word characters are Alphabetic + Mn+Mc+Me + Nd + Pc.
> Where did you get that definition from? UTS#18 defines
> "<word_character>", which is Alphabetic + U+200C + U+200D
> (i.e. not including marks, but including those
From UTS#18 RL1.2A in Annex C, where a \p{word} or \w character 
is defined to be 
 \p{alpha}
 \p{gc=Mark}
 \p{digit}
 \p{gc=Connector_Punctuation}
>> I think you are looking for here are Word characters without 
>> Nd + Pc, so just Alphabetic + Mn+Mc+Me. 
>> 
>> Is that right?
> 
> With your definition of "Word character" above, yes, that's right.
It's not mine. It's tr18's.
> Marks won't start a word, though.
That's the smarter boundary thing they talk about. 
I'm not myself familiar with \pM
> As for terminology: I think the documentation should continue to
> speak about "words" and "letters", and then define what is meant
> in this context. It's not that the Unicode consortium invented
> the term "letter", so we should use it more liberally than just
> referring to the L* categories.
I really don't think it wise to have private definitions of these.
If Letter doesn't mean L?, things get too weird. That's why 
there are separate definitions of alphabetic, word, etc.
--tom