Django URL syntax ?P<slug>[^\\.] -

in django url, ?p<slug>[^\\.] syntax mean?

url( r'^view/(?p<slug>[^\\.]+)/$', 'blog.views.view_post',  name='view_blog_post')), 

in python regex, (?p<name>regex) called named capturing group

so (?p<slug>[^\\.]+) capture character not of backslash or dot 1 or more times , store matches inside group name slug.

then may refer captured chars specifying it's index number or group name.