django - Question mark in url pattern -


django 1.11.2

i need url pattern 2 cases:

  1. /blog/
  2. /blog/.json/

so, in case of json, i'll respond application/json content type.

this url pattern seems acceptable:

url(r'^blog/?(?p<json>\.json)?/$', blogfront.as_view()),

at least, works. problem can't understand it.

the last ? match 0 or 1 repetitions of preceding re. it's ok. ? in middle capturing symbolic group.

what first question mark? mystery me. comment mean?

the first question mark makes preceeding / optional, making /blog.json/ valid. according question isn't want worth removing it


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