CODEWITHSUNDEEP
regexdjangodjango-urls
Ivan Semochkin
Ivan Semochkin

Reputation: 8897

Match file path in url regex

I need do match path of my image:
images/05a813eb-df00-4ed6-b8a5-2930f03fbf5d.jpg
I split it by dir, name and ext 

def url(self, name):
    prefix, _ = name.split('/')
    file_name, ext = _.split('.')
    return reverse('image_storage',
                   args=[prefix, file_name, ext])

so I have images, 05a813eb-df00-4ed6-b8a5-2930f03fbf5d, jpg my url pattern: 

url(r'^img/(?P<prefix>\w+)/(?P<uuid4>[0-9a-f][0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})\.(?P<ext>\w+)

but it doesn't matches, help me find solution please.

Upvotes: 1

Views: 1134

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626920

You can use

^images/(?:(?P<prefix>\w+)/)?(?P<uuid4>[0-9a-f]{8}(?:-[0-9a-f]{4}){3}-[0-9a-f]{12})\.(?P<ext>\w+)

See the regex demo

The optional dir after images/ is matched with an optional group (?:(?P<prefix>\w+)/)?. The ? quantifier matches 1 or 0 occurrences. If there can be more than 1, use * instead of ? (but I guess you'd have to think of correct "prefix" group boundaries).

Also, [0-9a-f][0-9a-f]{8} in your regex requies 9 chars, but there are 8 in fact.

3 consecutive -[0-9a-f]{4} can be just shrunk into another non-capturing group (?:-[0-9a-f]{4}){3}.

NOTE: It might be a good idea to prepend the pattern with (?i) (case insensitive modifier): (?i)^images/(?:(?P<prefix>\w+)/)?(?P<uuid4>[0-9a-f]{8}(?:-[0-9a-f]{4}){3}-[0-9a-f]{12})\.(?P<ext>\w+)

Upvotes: 2

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