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Fix issue11283 - Clarifying a re pattern in the re module docs for conditional regex

This commit is contained in:
Senthil Kumaran 2011-03-12 11:40:25 +08:00
parent 26606fd23f
commit abd4a05561
1 changed files with 6 additions and 5 deletions
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11
Doc/library/re.rst
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@ -295,11 +295,12 @@ The special characters are:
match at the beginning of the string being searched.
``(?(id/name)yes-pattern|no-pattern)``
Will try to match with ``yes-pattern`` if the group with given *id* or *name*
exists, and with ``no-pattern`` if it doesn't. ``no-pattern`` is optional and
can be omitted. For example, ``(<)?(\w+@\w+(?:\.\w+)+)(?(1)>)`` is a poor email
matching pattern, which will match with ``'<user@host.com>'`` as well as
``'user@host.com'``, but not with ``'<user@host.com'``.
Will try to match with ``yes-pattern`` if the group with given *id* or
*name* exists, and with ``no-pattern`` if it doesn't. ``no-pattern`` is
optional and can be omitted. For example,
``(<)?(\w+@\w+(?:\.\w+)+)(?(1)>|$)`` is a poor email matching pattern, which
will match with ``'<user@host.com>'`` as well as ``'user@host.com'``, but
not with ``'<user@host.com'`` nor ``'user@host.com>'`` .
The special sequences consist of ``'\'`` and a character from the list below.