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?
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