Python in a Nutshell

Name

subn

Synopsis

                        r.subn(repl,s,count=0)

subn is the same as sub, except that subn returns a pair ( new_string, n ) where n is the number of substitutions that subn has performed. For example, to count the number of occurrences of substring 'hello' in any mix of cases, one way is:

import re
rehello = re.compile(r'hello', re.IGNORECASE)
junk, count = rehello.subn('', astring)
print 'Found', count, 'occurrences of "hello"'