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

[R. David Murray]

R. David Murray added the comment:

I doubt this is a regression, so I'm marking the others versions as well without actually testing it.  Should be an easy fix.

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keywords: +easy
nosy: +r.david.murray
stage:  -> needs patch
versions: +Python 2.7, Python 3.4

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