[Tutor] search and replace
Danny Yoo
dyoo at hkn.eecs.berkeley.edu
Tue Mar 7 19:40:24 CET 2006
> regex allows us to specify certain conditions in the patterns
> such as whether the characters are digits etc, and also whether
> we are kooking for a word which is wat you want.
> Specifically \W signifies a word boundary so
>
> \Whello\W
>
> will find hello as a word.
Hi Alan,
Using the non-word pattern '\W' will work except in cases where we're
right at the edge:
######
>>> import re
>>> re.sub(r'\Whi\W', 'hello', 'hi there')
'hi there'
######
Slightly more robust is the '\b' boundary assertion pattern:
######
>>> re.sub(r'\bhi\b', 'hello', 'hi there')
'hello there'
######
Best of wishes!
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