New submission from Chris Seto:
Expected behavior:
~ ❯❯❯ pyenv shell 3.5.2
~ ❯❯❯ python --version
Python 3.5.2
~ ❯❯❯ python
Python 3.5.2 (default, Oct 24 2016, 00:12:20)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.38)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> re.compile('[^\B]')
re.compile('[^\\B]')
>>> re.compile(r'[^\B]')
re.compile('[^\\B]')
Actual:
~ ❯❯❯ pyenv shell 3.6.0
~ ❯❯❯ python --version
Python 3.6.0
~ ❯❯❯ python
Python 3.6.0 (default, Apr 26 2017, 17:24:07)
[GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.38)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> re.compile('[^\B]')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/re.py", line 233,
in compile
return _compile(pattern, flags)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/re.py", line 301,
in _compile
p = sre_compile.compile(pattern, flags)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_compile.py",
line 562, in compile
p = sre_parse.parse(p, flags)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 856, in parse
p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, False)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 415, in _parse_sub
itemsappend(_parse(source, state, verbose))
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 526, in _parse
code1 = _class_escape(source, this)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 336, in _class_escape
raise source.error('bad escape %s' % escape, len(escape))
sre_constants.error: bad escape \B at position 2
>>> re.compile(r'[^\B]')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/re.py", line 233,
in compile
return _compile(pattern, flags)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/re.py", line 301,
in _compile
p = sre_compile.compile(pattern, flags)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_compile.py",
line 562, in compile
p = sre_parse.parse(p, flags)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 856, in parse
p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, False)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 415, in _parse_sub
itemsappend(_parse(source, state, verbose))
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 526, in _parse
code1 = _class_escape(source, this)
File "/Users/chrisseto/.pyenv/versions/3.6.0/lib/python3.6/sre_parse.py",
line 336, in _class_escape
raise source.error('bad escape %s' % escape, len(escape))
sre_constants.error: bad escape \B at position 2
----------
components: Regular Expressions
messages: 292445
nosy: Chris Seto2, ezio.melotti, mrabarnett
priority: normal
severity: normal
status: open
title: Regex becomes invalid in python 3.6
type: behavior
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30187>
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