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Issue #23622: Unknown escapes in regular expressions that consist of `'\'`

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and ASCII letter now raise a deprecation warning and will be forbidden in
Python 3.6.
This commit is contained in:
Serhiy Storchaka 2015-03-24 22:58:14 +02:00
parent 793c14ea29
commit a54aae0683
6 changed files with 60 additions and 19 deletions
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2
Doc/howto/regex.rst
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@ -1138,7 +1138,7 @@ Empty matches are replaced only when they're not adjacent to a previous match.
If *replacement* is a string, any backslash escapes in it are processed. That
is, ``\n`` is converted to a single newline character, ``\r`` is converted to a
carriage return, and so forth. Unknown escapes such as ``\j`` are left alone.
carriage return, and so forth. Unknown escapes such as ``\&`` are left alone.
Backreferences, such as ``\6``, are replaced with the substring matched by the
corresponding group in the RE. This lets you incorporate portions of the
original text in the resulting replacement string.

10
Doc/library/re.rst
View file

@ -438,6 +438,10 @@ three digits in length.
.. versionchanged:: 3.3
The ``'\u'`` and ``'\U'`` escape sequences have been added.
.. deprecated-removed:: 3.5 3.6
Unknown escapes consist of ``'\'`` and ASCII letter now raise a
deprecation warning and will be forbidden in Python 3.6.
.. seealso::
@ -687,7 +691,7 @@ form.
*string* is returned unchanged. *repl* can be a string or a function; if it is
a string, any backslash escapes in it are processed. That is, ``\n`` is
converted to a single newline character, ``\r`` is converted to a carriage return, and
so forth. Unknown escapes such as ``\j`` are left alone. Backreferences, such
so forth. Unknown escapes such as ``\&`` are left alone. Backreferences, such
as ``\6``, are replaced with the substring matched by group 6 in the pattern.
For example:
@ -732,6 +736,10 @@ form.
.. versionchanged:: 3.5
Unmatched groups are replaced with an empty string.
.. deprecated-removed:: 3.5 3.6
Unknown escapes consist of ``'\'`` and ASCII letter now raise a
deprecation warning and will be forbidden in Python 3.6.
.. function:: subn(pattern, repl, string, count=0, flags=0)