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bpo-32603: Deprecation warning on strings used in re module #5255

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merged 1 commit into from Jan 20, 2019
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bpo-32603: Deprecation warning on strings used in re module #5255

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5 changes: 4 additions & 1 deletion Doc/library/re.rst
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Expand Up @@ -28,7 +28,10 @@ character for the same purpose in string literals; for example, to match
a literal backslash, one might have to write ``'\\\\'`` as the pattern
string, because the regular expression must be ``\\``, and each
backslash must be expressed as ``\\`` inside a regular Python string
literal.
literal. Also, please note that any invalid escape sequences in Python's
usage of the backslash in string literals now generate a :exc:`DeprecationWarning`
and in the future this will become a :exc:`SyntaxError`. This behaviour
will happen even if it is a valid escape sequence for a regular expression.

The solution is to use Python's raw string notation for regular expression
patterns; backslashes are not handled in any special way in a string literal
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