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Add information about DeprecationWarning for invalid escaped characters in the re module (GH-5255)

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Pablo Galindo 2019-01-20 18:57:56 +00:00 • committed by GitHub
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@ -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 a literal backslash, one might have to write ``'\\\\'`` as the pattern
string, because the regular expression must be ``\\``, and each string, because the regular expression must be ``\\``, and each
backslash must be expressed as ``\\`` inside a regular Python string 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 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 patterns; backslashes are not handled in any special way in a string literal