[issue29015] re slashes

[Сергей Снегирёв]

New submission from Сергей Снегирёв:

>>> path
'd:/\\temp\\\\'
>>> pat = '[{}]+'.format(re.escape('\\/'))
>>> re.sub(pat, '\\', path)
Traceback (most recent call last):
  File "<pyshell#78>", line 1, in <module>
    re.sub(pat, '\\', path)
  File "C:\Users\Сергей\AppData\Local\Programs\Python\Python35\lib\re.py", line 182, in sub
    return _compile(pattern, flags).sub(repl, string, count)
  File "C:\Users\Сергей\AppData\Local\Programs\Python\Python35\lib\re.py", line 325, in _subx
    template = _compile_repl(template, pattern)
  File "C:\Users\Сергей\AppData\Local\Programs\Python\Python35\lib\re.py", line 312, in _compile_repl
    p = sre_parse.parse_template(repl, pattern)
  File "C:\Users\Сергей\AppData\Local\Programs\Python\Python35\lib\sre_parse.py", line 849, in parse_template
    s = Tokenizer(source)
  File "C:\Users\Сергей\AppData\Local\Programs\Python\Python35\lib\sre_parse.py", line 225, in __init__
    self.__next()
  File "C:\Users\Сергей\AppData\Local\Programs\Python\Python35\lib\sre_parse.py", line 239, in __next
    self.string, len(self.string) - 1) from None
sre_constants.error: bad escape (end of pattern) at position 0
>>> pat
'[\\\\\\/]+'
>>> 

In JS it works:

> 'd:/\\temp\\\\'.replace(new RegExp('[\\\\\\/]+', 'g'), '\\')
"d:\temp\"

----------
components: Regular Expressions
messages: 283626
nosy: ezio.melotti, mrabarnett, Сергей Снегирёв
priority: normal
severity: normal
status: open
title: re slashes
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29015>
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