Hi,
> import re
> foo_pattern = re.compile('foo')
>
> '>>> m = foo_pattern.search(subject)
> '>>> if m:
> '>>> pass
> '>>> else:
> '>>> pass
I agree that is horrible. This is one of my favorite problems with
python syntax.
> but it occured to me today, that it is possible to do it in python
> without the extra line.
> '
> '>>> def xsearch(pattern, subject):
> '>>> yield pattern.search(subject)
>
> '>>> for m in xsearch(foo_pattern, subject):
> '>>> pass
> '>>> else:
> '>>> pass
I think I wouldd rather have it this way, based on a suggestion by
Diez B. Roggisch recently:
import re
class matcher:
def __init__(self, regex):
self.regex = re.compile(regex)
def match(self, s):
self.m = self.regex.match(s)
return not self.m is None
def search(self, s):
self.m = self.regex.search(s)
return not self.m is None
def group(self, n = None):
if n is None:
return self.m.group()
return self.m.group(n)
m = matcher('(foo)(.*)')
if m.match('foobar'):
print m.group()
if m.search('barfoobaz'):
print m.group(2)
I think one solution that does not need a wrapper class would be to
add the group() method to the match objects from module 're'. IIRC,
the obsolete package 'regex' provided this, once upon a time.
Cheers,
Johann
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