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| author | Martin Panter <vadmium+py@gmail.com> | 2016-10-15 01:18:16 (GMT) |
|---|---|---|
| committer | Martin Panter <vadmium+py@gmail.com> | 2016-10-15 01:18:16 (GMT) |
| commit | 684340ede58776d77a104c689e821d1eab36bf63 (patch) | |
| tree | 5b79ad98de861e79fcd5caa9e2aa75854ef1672c | |
| parent | c73e9d844fcc9e91eff5ff933336aa46005bdefc (diff) | |
| download | cpython-684340ede58776d77a104c689e821d1eab36bf63.zip cpython-684340ede58776d77a104c689e821d1eab36bf63.tar.gz cpython-684340ede58776d77a104c689e821d1eab36bf63.tar.bz2 | |
Issue #27800: Document limitation and workaround for multiple RE repetitions
| -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 569b522..1ca621e 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: |