On Jul 3, 2008, at 1:56 PM, IanSR wrote:
> I have just tested the following example re code in sage, and it fails
> both on a Linux install and a Mac OS X install:
>
> import re
> p = re.compile('(a(b)c)d')
> m = p.match('abcd')
> m.group(0)
> # expect: 'abcd'
> m.group(1)
> # expect: 'abc'
> m.group(2)
> # expect: 'b'
>
> This is take from:
>
> http://www.amk.ca/python/howto/regex/
>
> What's going on? Does sage have some special version of the re module
> that doesn't support pattern groups?
The problem is related to preparsing.
This will work:
import re
p = re.compile('(a(b)c)d')
m = p.match('abcd')
m.group(int(0))
Your original code gets preparsed into the following:
import re
p = re.compile('(a(b)c)d')
m = p.match('abcd')
m.group(Integer(0))
And I suppose the group() method doesn't know how to handle Integers
correctly, which is strange, since I thought this is what the
__index__() method is for....
david
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/sage-support
URLs: http://www.sagemath.org
-~----------~----~----~----~------~----~------~--~---
