New submission from Dan Haffey:
Error reporting for recursive backreferences in regexes isn't consistent across
both types of backref. Here's the exception for a recursive numeric backref:
>>> import re
>>> re.compile(r'(\1)')
Traceback (most recent call last):
...
sre_constants.error: cannot refer to an open group at position 1
Here's what I'm seeing on the 3.5 branch for a named backref:
>>> re.compile(r'(?P<spam>(?P=spam))')
Traceback (most recent call last):
...
RecursionError: maximum recursion depth exceeded
Which is an improvement over 3.4 and below, where compilation succeeds and
appears to treat (?P=spam) as valid but unmatchable.
----------
components: Regular Expressions
messages: 246390
nosy: dhaffey, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: Wrong or missing exception when compiling regexes with recursive named
backreferences
type: behavior
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Python tracker <[email protected]>
<http://bugs.python.org/issue24580>
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