In article <94ph22frh...@mid.individual.net>,
Neil Cerutti <ne...@norwich.edu> wrote:
> On 2011-06-01, ru...@yahoo.com <ru...@yahoo.com> wrote:
> > For some odd reason (perhaps because they are used a lot in
> > Perl), this groups seems to have a great aversion to regular
> > expressions. Too bad because this is a typical problem where
> > their use is the best solution.
>
> Python's str methods, when they're sufficent, are usually more
> efficient.
I was all set to say, "prove it!" when I decided to try an experiment.
Much to my surprise, for at least one common case, this is indeed
correct.
-------------------------------------------------
#!/usr/bin/env python
import timeit
text = '''Lorem ipsum dolor sit amet, consectetur adipiscing
elit. Mauris congue risus et purus lobortis facilisis. In
nec quam dolor, non blandit tellus. Suspendisse tempus,
sapien ac mattis volutpat, lectus elit auctor lacus, vitae
accumsan nunc elit in ligula. Curabitur quis mauris
neque. Etiam auctor eleifend arcu in egestas. Pellentesque
non mauris sit amet nulla aliquam hendrerit pretium id
arcu. Ut fringilla tempor lorem eget tincidunt. Duis nibh
nisi, iaculis sed scelerisque in, facilisis quis
dui. Aliquam varius diam in turpis auctor dapibus. Fusce
aliquet erat vestibulum mauris volutpat id laoreet enim
fermentum. Nam at justo nibh, ut vulputate dui.
libero. Nunc ac risus justo, in sodales erat.
'''
text = ' '.join(text.split())
t1 = timeit.Timer("'laoreet' in text",
"text = '%s'" % text)
t2 = timeit.Timer("pattern.search(text)",
"import re; pattern = re.compile('laoreet'); text =
'%s'" % text)
print t1.timeit()
print t2.timeit()
-------------------------------------------------
./contains.py
0.990975856781
1.91417002678
-------------------------------------------------
> Perl integrated regular expressions, while Python relegated them
> to a library.
The same way Python relegates most everything to a library :-)
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