[Tutor] the regex boundary about chinese word

[goog cheng]

Hi,  I got this problem :

#!python
# -*- coding: utf-8 -*-
import re

p = re.compile(ur'\bc123\b')
print '**',p.search('no class c123 at all').group()

p = re.compile(ur'\b\u7a0b\u6770\b')
print ur'\u7a0b\u6770'
print '****',p.search(' 程杰 abc'.decode('utf8'))

why the  \b   boundary  can't match the word '程杰'
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