[issue18155] csv.Sniffer.has_header doesn't escape characters used in regex

[Roundup Robot]

Roundup Robot added the comment:

New changeset 68ff68f9a0d5 by R David Murray in branch '3.3':
#18155: Regex-escape delimiter, in case it is a regex special char.
http://hg.python.org/cpython/rev/68ff68f9a0d5

New changeset acaf73e3d882 by R David Murray in branch 'default':
Merge #18155: Regex-escape delimiter, in case it is a regex special char.
http://hg.python.org/cpython/rev/acaf73e3d882

New changeset 0e1d538d36dc by R David Murray in branch '2.7':
#18155: Regex-escape delimiter, in case it is a regex special char.
http://hg.python.org/cpython/rev/0e1d538d36dc

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nosy: +python-dev

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<http://bugs.python.org/issue18155>
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