[ python-Bugs-1058786 ] r'\10' as replacement pattern loops in compilation

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Bugs item #1058786, was opened at 2004-11-02 13:39
Message generated for change (Comment added) made by jlgijsbers
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Category: Regular Expressions
Group: Python 2.2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Nick Maclaren (nmm1)
Assigned to: Fredrik Lundh (effbot)
Summary: r'\10' as replacement pattern loops in compilation

Initial Comment:
The following program loops under at least Solaris 9
on SPARC and Linux (kernel 2.6) in x86.  From
tracebacks, it seems to be in the internal compilation
of the pattern r'\10'.

from re import compile

line = ""

pat = compile(12 * r'(\d+)')

ltarget = float(pat.sub(r'\10',line))

print ltarget


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>Comment By: Johannes Gijsbers (jlgijsbers)
Date: 2004-11-02 14:07

Message:
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I get the following on Python 2.4/Linux 2.6.8, so it does
seem to be fixed:

>>> from re import compile
>>> line = ""
>>> pat = compile(12 * r'(\d+)')
>>> ltarget = float(pat.sub(r'\10',line))
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ValueError: empty string for float()

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Comment By: Fredrik Lundh (effbot)
Date: 2004-11-02 14:00

Message:
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user_id=38376

If you need a workaround for 2.2, use a sub callback:

http://effbot.org/zone/re-sub.htm#callbacks

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Comment By: Fredrik Lundh (effbot)
Date: 2004-11-02 13:58

Message:
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user_id=38376

Cannot check this right now, but I'm 99% sure that this has 
been fixed in 2.4.

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