What does this Django regular expression mean? `?P`

Question

I have the following regular expression (regex) in my urls.py and I\'d like to know what it means. Specifically the (?P portion o

Answer 1

(?P) creates a match group named category_slug.

The regex itself matches a string starting with category/ and then a mix of alphanumeric characters, the dash - and the underscore _, followed by a trailing slash.

Example URLs accepted by the regex:

• category/foo/
• category/foo_bar-baz/
• category/12345/
• category/q1e2_asdf/