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| -rw-r--r-- | Doc/library/re.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/re.rst b/Doc/library/re.rst index 8ffcd9a820..c9f2263375 100644 --- a/Doc/library/re.rst +++ b/Doc/library/re.rst @@ -79,6 +79,12 @@ how the regular expressions around them are interpreted. Regular expression pattern strings may not contain null bytes, but can specify the null byte using a ``\number`` notation such as ``'\x00'``. +Repetition qualifiers (``*``, ``+``, ``?``, ``{m,n}``, etc) cannot be +directly nested. This avoids ambiguity with the non-greedy modifier suffix +``?``, and with other modifiers in other implementations. To apply a second +repetition to an inner repetition, parentheses may be used. For example, +the expression ``(?:a{6})*`` matches any multiple of six ``'a'`` characters. + The special characters are: |