A vote for re scanner

[Wade Leftwich]

Alex Martelli <aleax at aleax.it> wrote:
> Wade Leftwich wrote:
>    ...
> > A scanner is constructed from a regex object and a string to be
> > scanned. Each call to the scanner's search() method returns the next
> > match object of the regex on the string. So to work on a string that
> > has multiple matches, it's the bee's roller skates.
> 
> ...if that method's name was 'next' (and an appropriate __iter__
> also present) it might be even cooler, though...
> 
> 
> Alex

Indeed:

>>> class CoolerScanner(object):
... 	def __init__(self, regex, s):
... 		self.scanner = regex.scanner(s)
... 	def next(self):
... 		m = self.scanner.search()
... 		if m:
... 			return m
... 		else:
... 			raise StopIteration
... 	def __iter__(self):
... 		while 1:
... 			yield self.next()
... 
>>> regex = re.compile(r'(?P<before>.)a(?P<after>.)')
>>> s = '1ab2ac3ad'
>>> for m in CoolerScanner(regex, s):
... 	print m.group('before'), m.group('after')
... 	
1 b
2 c
3 d
>>> 

-- Wade