nginx location regex multiple elements

Question

I want to create one location regex for an endpoint that I currently serve using the following four rules.

location ~* ^/api/(?<version>.*)/(?<service>.*)(/.*/.*/.*/.*)$ {
...
}

location ~* ^/api/(?<version>.*)/(?<service>.*)(/.*/.*/.*)$ {
...
}

location ~* ^/api/(?<version>.*)/(?<service>.*)(/.*/.*)$ {
...
}

location ~* ^/api/(?<version>.*)/(?<service>.*)(/.*)$ {
...
}

That allow an access to my APIs using the following routes:

https://myapp.mydomain.com/api/v1/anyservice/foo
https://myapp.mydomain.com/api/v2/anyservice/foo/bar
https://myapp.mydomain.com/api/v1/anotherservice/foo/bar/thingy
https://myapp.mydomain.com/api/v1/anotherservice/foo/bar/thingy/owl

I have tried many solutions. For example:

location ~* "^/api/(?<version>.*)/(?<service>.*)(/.*){1,4}$" {
...
}

or

location ~* "^/api/(?<version>.*)/(?<service>.*)(/.*)*$" {
...
}

None of the solution I've tried has worked. Any idea ?

yes, it's a multi-version micro-services environment. The values of version and service are also injected into the header of the requests. — Laurent GRENIER
– Laurent GRENIER, Commented Nov 23, 2018 at 14:29

Poul Bak · Accepted Answer · 2018-11-23 14:51:37Z

4

You can use this regex to achive your goal:

/api/(?<version>[^/]+)/(?<service>[^/]+)(?:/[^/]+){1,4}$

You must set the 'multiline' option if your text contains more than one line (like in exmaple above).

The regex starts matching '/api/' (Note the '^' symbol you had is removed, since it's not start of line).

Then it creates a named Group 'version' that matches any characters not being a slash, then a slash and a new named Group 'service. Again it matches any character not being a slash.

Then it creates a non capturing Group, matching a slash followed by any characters not being a slash. This Group is matched from 1 to 4 times.

Edit:

To match the path in a Group, I have changed to include a named Group called 'path':

/api/(?<version>[^/]+)/(?<service>[^/]+)(?<path>(?:/[^/]+){1,4})$

Now you get the path in the 'path' Group.

answered Nov 23, 2018 at 14:51

Poul Bak

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Laurent GRENIER Over a year ago

Your solution works perfectly ! Note that you have to put some the regex between quotes because of {.

Laurent Mouchart · Accepted Answer · 2018-11-23 14:38:48Z

1

I don't know if i understood your question correctly but this RegEx might solve it.

.*\/api\/(v\d)\/(.+service)(\/.+\/?)*

It matches every given example.

In Group 1 it captures the Version.

In Group 2 it captures the Service.

In Group 3 it captures the /foo.

answered Nov 23, 2018 at 14:38

Laurent Mouchart

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