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Issue #27800: Merge RE repetition doc from 3.6

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Martin Panter 2016-10-15 01:39:21 +00:00
parent 8a42581bc2 479eb760f4
commit 20e086efc7
1 changed files with 6 additions and 0 deletions
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@ -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: