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Diffstat (limited to 'Doc/library/re.rst')
| -rw-r--r-- | Doc/library/re.rst | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Doc/library/re.rst b/Doc/library/re.rst index 2f82955..ac6455a 100644 --- a/Doc/library/re.rst +++ b/Doc/library/re.rst @@ -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 |