New submission from Phillip Feldman <phillip.m.feld...@gmail.com>:
The first example below works; the second one produces output containing
garbage characters. (This came up while I was creating a set of examples for a
tutorial on regular expressions).
import re
text= "The cat ate the rat."
print("before: %s" % text)
m= re.search("The (\w+) ate the (\w+)", text)
text= "The %s ate the %s." % (m.group(2), m.group(1))
print("after : %s" % text)
text= "The cat ate the rat."
print("before: %s" % text)
text= re.sub("(\w+) ate the (\w+)", "\2 ate the \1", text)
print("after : %s" % text)
----------
components: Regular Expressions
messages: 155100
nosy: Phillip.M.Feldman, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: re.sub backreferences to numbered groups produce garbage
type: behavior
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14221>
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