[issue755670] improve HTMLParser attribute processing regexps

[T. Middleton]

T. Middleton added the comment:

I for one thank smroid for the patch. I also have hit *all* of these 
cases in the wild. This patch makes real-life a lot less frustrating. 
This patch is surely a lot more preferable than HTMLParser's tendency 
to just throw up its hands and quietly give up. And one might even 
make a case that in the horrific world of HTML "standards" case #2 and 
#3 can be considered actually valid (as much as it hurts to say so).

----------
nosy: +timtoo

____________________________________
Tracker <report at bugs.python.org>
<http://bugs.python.org/issue755670>
____________________________________