John,
Thanks...I was a bit deep in a script trying to figure out why I kept
getting global key errors (trying to make sure that re.compile and
import re weren't run but once...doh?) when you responded.
I guess that settles it, then...for this particular instance, '"J" in s'
is indeed faster th
On 07/11/06, Jonathon Sisson <[EMAIL PROTECTED]> wrote:
> Just out of curiousity (since I really can't say myself), does the code
> below import re each time it loops? I ran the same commands and saw
> quite similar results (0.176 usec per loop for the first test and 0.993
> usec per loop for the
Just out of curiousity (since I really can't say myself), does the code
below import re each time it loops? I ran the same commands and saw
quite similar results (0.176 usec per loop for the first test and 0.993
usec per loop for the second test), and I was just curious if that
import (and the
On 07/11/06, Kent Johnson <[EMAIL PROTECTED]> wrote:
> If anyone really cares which Python implementation is faster, the timeit
> module is your friend. Assertions like "would probably be faster" or
> "it's also quicker" don't hold much weight. In Python, if you want to
> know what is faster, you m
"Michael Sparks" <[EMAIL PROTECTED]> wrote
> A regex compiles to a jump table, and executes as a statemachine.
Sometimes, but it depends on the implementation.
If someone uses a C++ compiler that uses the standard library
implememation of regex (like say the Microsoft Visual C++
version up till V
Alan Gauld wrote:
> "Michael Sparks" <[EMAIL PROTECTED]> wrote
>>
>> That's equivalent to the regular expression:
>>* ^[0-9A-Za-z_.-]*$
>
> While using a dictionary is probably overkill, so is a regex.
> A simple string holding all characters and an 'in' test would probably
> be both easier to
On Monday 06 November 2006 01:08, Alan Gauld wrote:
> While using a dictionary is probably overkill, so is a regex.
No, in this case it's absolutely the right choice.
> A simple string holding all characters and an 'in' test would probably
> be both easier to read and faster.
I'm stunned you th
"Michael Sparks" <[EMAIL PROTECTED]> wrote
> The most pathological example of regex avoidance I've seen in a
> while
> is this:
>
> def isPlain(text):
>plaindict = {'-': True, '.': True, '1': True, '0': True, '3':
> True,
> '2': True, '5': True, '4': True, '7': True, '6': True, '9':
>
Michael Sparks wrote:
> On Sunday 05 November 2006 15:02, Kent Johnson wrote:
> ...
>> Regular expressions are an extremely powerful and useful tool that every
>> programmer should master and then put away and not use when there is an
>> alternative :-)
>
>
>
> There's always an alternative to a
On Sunday 05 November 2006 15:02, Kent Johnson wrote:
...
> Regular expressions are an extremely powerful and useful tool that every
> programmer should master and then put away and not use when there is an
> alternative :-)
There's always an alternative to a regular expression, so are you reall
Alan Gauld wrote:
> But I sure agree with it. The problem with Regex is that they can
> be just a bit too powerful. To cite another programming proverb,
> this time by Bjarne Stroustrup I think:
>
> "C makes it easy to shoot yourself in the foot;
> C++ makes it harder, but when you do,
> it blows
Ahh, sorry, sorry. I haven't been able to locate the thread that I read
that summarized passage from, so I can't say who exactly said all of that...
Nice quote on C/C++...made me laugh.
Jonathon
Alan Gauld wrote:
> "Jonathon Sisson" <[EMAIL PROTECTED]> wrote
>
>> of them they're addicting...
"Jonathon Sisson" <[EMAIL PROTECTED]> wrote
> of them they're addicting... As Alan Gauld stated in another thread
> (I'm
> pretty sure it was Alan): You'll get to the point that you want to
> use
> (regular expressions) all the time, even if they aren't the right
> tool
Nope, it wasn't me, may
Asrarahmed Kadri wrote:
> tries to supply negative values, then match will return None.
> So no hassle of using all those Ifs and Elifs
> I think REGULAR Expressions can be quite powerful...
Indeed...Regular expressions were discovered etched into the blade of a
sword that had been pl
Hi Folks,
I dont know much about Regular Expressions. But I just want to share my ideas.
I was trying to implement error checking code on the date argument:
I did this:
import re
# the user should enter date in the format: dd/mm/
p = re.compile('\d\d/\d\d/\d\d\d\d')
m = p.match(da
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