CODEWITHSUNDEEP
regexasp.net-web-apiattributerouting
Tomas Aschan
Tomas Aschan

Reputation: 60674

WebAPI route regex with optional parts

I want to map a WebAPI action method to urls on the format api/v2/l8n/{cultureCode}, but to avoid route collisions with other methods, I need to constrain the cultureCode parameter to only values matching the regex ^\w{2}(?:-\w{2})?$, i.e. sv and en-GB, but not hello.

I have a RoutePrefix attribute on the controller that takes care of api/v2/i8n, so I tried mapping the action with

[Route(@"{cultureString:regex(^\w{2}(?:-\w{2})?$)")]

but then an error was thrown at configuration time stating that {cultureString:regex(^\w{2 was a bad route value. I tried replacing \w{2} with \w\w as well as removing the @ and escaping my backslashes, but was then instead presented with

The route template cannot start with a '/' or '~' character and it cannot contain a '?' character.

If I can't even use ?, how can I ever create a regex with an optional part?

Upvotes: 0

Views: 1671

Answers (1)

Amit Joki
Amit Joki

Reputation: 59292

I do hope there is no such limitation on the pipeline operator or alternation operator, using which and some anchors, you could get it to work.

[Route(@"{cultureString:regex(^\w\w(-\w{2}|)$)}")]

What the above means is that it matches either two \w followed by another two \w or end of the string, $

Upvotes: 1

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