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How does B regular expression work in Python?
The word boundary \b matches positions where one side is a word character (usually a letter, digit or underscore)
\B matches all positions where \b doesn't match.
The following code shows how regexpr \B works
import re result = re.findall(r'\Bcat', 'certificate') result2 = re.findall(r'\Bcat', 'tomcat') result3 = re.findall(r'\Bcat', 'catfish') print result, result2,result3
This gives the output
['cat'] ['cat'] 
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