Spring RequestMapping Regex to exclude string

Question

Background: I'm trying to create a backend for a 'Single Page App' web client, that routes all requests to the index.html entrypoint except for anything under /assets/. "/" is mapped to /index.html in a ResourceHandler, and works fine.

Problem: I want to match all paths that do not start with '/assets/' with the RequestMapping in Spring. This works if I positively match 'assets', but not if I negatively match 'assets' in the regex.

@ControllerAdvice
@RequestMapping(value="/**")
public class SPARouter {

    @RequestMapping(value = {"/{path:(?!assets)}/**"}, method = RequestMethod.GET)
    public String router() {
        return "forward:/";
    }

}

The above code does not work as it never matches any URL. If I replace "/{path:(?!assets)}/**" with "/{path:assets}/**" it will match a URL like /assets/...

So the thing that does not work is the negative lookahead / match in the regex.

Is it possible to negatively match a pattern in this way?

stackoverflow.com/questions/52003857/… Check that

Sachini Wickramaratne
– Sachini Wickramaratne

2019-10-03 09:17:54 +00:00
Commented Oct 3, 2019 at 9:17 — Sachini Wickramaratne
– Sachini Wickramaratne, Commented Oct 3, 2019 at 9:17
That nailed it - thanks

Damian
– Damian

2019-10-03 09:25:29 +00:00
Commented Oct 3, 2019 at 9:25 — Damian
– Damian, Commented Oct 3, 2019 at 9:25
So what was the working regex??

Roger
– Roger

2024-09-04 07:15:19 +00:00
Commented Sep 4, 2024 at 7:15 — Roger
– Roger, Commented Sep 4, 2024 at 7:15

Michael Piefel · Accepted Answer · 2019-10-03 09:16:23Z

2

I’m not too sure about the negative matching part…

But for your concrete problem (forwarding to / for everything except something), the solution I have successfully used is an interceptor. The interceptor checks on the URL, forwards if necessary and, well, doesn’t if not.

answered Oct 3, 2019 at 9:16

Michael Piefel

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1 Comment

Damian Over a year ago

Thanks for the interceptor hint - I was originally looking for the spring boot way of interfering with the request pipeline.

AbhiN · Accepted Answer · 2019-10-03 09:18:34Z

0

Try using ^ in mapping as below

@RequestMapping(value = {"/{path:^(?!assets)}/**"}, method = RequestMethod.GET)

answered Oct 3, 2019 at 9:18

AbhiN

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1 Comment

Damian Over a year ago

Unfortunately it doesn't work. One of the many variations of the regex I've tried.

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