来自re模块的python正则表达式是否支持单词边界(\b)?

word = 'two'
re.compile(r'\b%s\b' % word, re.I)

>>> word = 'two'
>>> k = re.compile(r'\b%s\b' % word, re.I)
>>> x = 'one two three'
>>> y = k.search( x)
>>> y
<_sre.SRE_Match object at 0x100418850>

>>> x = 'one two three'
>>> y = re.search(r"\btwo\b", x)
>>> y
<_sre.SRE_Match object at 0x100418a58>
>>> 

re.search(r"\btwo\b", x)

"\b" "\x08"

"\\b"

r"\b"

https://docs.python.org/2/library/re.html#regular-expression-syntax

re.search("\btwo\b", x) \b

print("foo\bbar")
fobar

"\btwo\b" two x = 'one two three'

re.search compile "\\btwo\\b" r"\btwo\b"