[issue13409] Invalid expression error if a regex ends with a backslash

[Michał Leśniewski]

New submission from Michał Leśniewski <mlesniew at gmail.com>:

If a regular expression ends with a backslash, an exception is raised. Of course, the backslash has to be escaped. The simplest example, that causes the error is a regular expression, that should match only a single backslash:

    import re
    r = re.compile("\\")

----------
components: Regular Expressions
messages: 147696
nosy: ezio.melotti, mlesniew
priority: normal
severity: normal
status: open
title: Invalid expression error if a regex ends with a backslash
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13409>
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