group 0 in the re module

[Yingjie Lan]

Hi,

According to the doc, group(0) is the entire match.

But if you do this:'\x00 to 757-234'

where I expected
'757234 to 757-234'

Then I found that in python re '\0' is considered an octal number.
So, is there anyway to refer to the entire match by an escaped
notation?

Thanks,

Yingjie

 

[J. Gerlach]

Am 08.12.2010 03:23, schrieb Yingjie Lan:

Hi,

According to the doc, group(0) is the entire match.


But if you do this:
'\x00 to 757-234'

where I expected
'757234 to 757-234'

Then I found that in python re '\0' is considered an octal number.
So, is there anyway to refer to the entire match by an escaped
notation?

Thanks,

Yingjie

the documentation of the re module says:

\g<number> uses the corresponding group number; \g<2> is
therefore equivalent to \2, but isn’t ambiguous in a replacement such
as \g<2>0. \20 would be interpreted as a reference to group 20, not a
reference to group 2 followed by the literal character '0'. The
backreference \g<0> substitutes in the entire substring matched by
the RE.

... so you're looking for r"\g<0> to \1-\2"