Bug in re module?

[Ant]

Look at the following minimal example:

>>import re
p = re.compile(r"(:?Test) (String)")
m = p.search("This is a Test String OK?")
m.groups()

('Test', 'String')

I would have expected this to produce:

('String')

since (:?...) should be a non-capturing group. From the module
reference:

(?:...)
A non-grouping version of regular parentheses. Matches whatever
regular expression is inside the parentheses, but the substring matched
by the group cannot be retrieved after performing a match or referenced
later in the pattern.

[Ant]

Ant wrote:

Look at the following minimal example:

.... (snip example that shows non-capturing group capturing)

Note I get the same results from python versions 2.4 and 2.5.

[Just]

In article <11**********************@k70g2000cwa.googlegroups .com>,
"Ant" <an****@gmail.comwrote:

Ant wrote:

Look at the following minimal example:

... (snip example that shows non-capturing group capturing)

Note I get the same results from python versions 2.4 and 2.5.

Try ?: instead of :?

Just

[John Machin]

Ant wrote:

Look at the following minimal example:

>import re
p = re.compile(r"(:?Test) (String)")

Bzzzzzt! Sorry, PBKAC.

The correct syntax is (?:foo)
You have (:?foo)
which matches an optional colon followed by foo.

Now quick kill your post before the effbot spots it :-)

>m = p.search("This is a Test String OK?")
m.groups()

('Test', 'String')

I would have expected this to produce:

('String')

since (:?...) should be a non-capturing group. From the module
reference:

(?:...)
A non-grouping version of regular parentheses. Matches whatever
regular expression is inside the parentheses, but the substring matched
by the group cannot be retrieved after performing a match or referenced
later in the pattern.

[Fredrik Lundh]

Ant wrote:

>

I would have expected this to produce:

('String')

since (:?...) should be a non-capturing group. From the module
reference:

(?:...)

(?:...) isn't the same thing as (:?...), though.

</F>

[Ant]

Just wrote:

Try ?: instead of :?

Duh. Put it down to Friday afternoon!

:-\

Don't know what I was thinking that something as high profile as that
could slip through the net!!

[Ant]

John Machin wrote:

Now quick kill your post before the effbot spots it :-)

Too late - the post was 3 minutes ago you know ;-)

[Bruno Desthuilliers]

Ant wrote:

John Machin wrote:

>Now quick kill your post before the effbot spots it :-)

Too late - the post was 3 minutes ago you know ;-)

Must be your lucky day - he did spot it, and you're still alive !-)
--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'o****@xiludom.gro'.split('@')])"

[Bruno Desthuilliers]

Ant wrote:

John Machin wrote:

>Now quick kill your post before the effbot spots it :-)

Too late - the post was 3 minutes ago you know ;-)

+1 QOTW, BTW

--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'o****@xiludom.gro'.split('@')])"