Kubernetes: Ingress-nginx does not work well with subpaths in the /api route - nginx

Question

I'm trying to access the subpaths in my backend, but it doesn't seem to work for anything, such as /api/hello, other than /api/.
This is my config:
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ingress-service
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/use-regex: "true"
# ADD ANNOTATION
nginx.ingress.kubernetes.io/rewrite-target: /$2
spec:
rules:
- host: example.com
http:
paths:
- path: /api(/|$)(.*)
# UPDATE PATH
pathType: Prefix
backend:
service:
name: server-srv
port:
number: 3000
- path: /
pathType: Prefix
backend:
service:
name: client-srv
port:
number: 3000
When trying to access the subpaths in /api, I will receive 404 not found.
Any help would be very appreciated ~!

Answer 1

Each path in an Ingress is required to have a corresponding path type. Paths that do not include an explicit pathType will fail validation.
The only supported wildcard character for the path field of an Ingress is the * character. The * character must follow a forward slash (/) and must be the last character in the pattern.
For example, /, /foo/, and /foo/bar/* are valid patterns, but , /foo/bar, and /foo//bar are not.A more specific pattern takes precedence over a less specific pattern. If you have both /foo/ and /foo/bar/, then /foo/bar/bat is taken to match /foo/bar/.For more information about path limitations and pattern matching, see the URL Maps documentation.
Suggestion : Try by mentioning the path as /api/*
Additional reference doc :
https://github.com/kubernetes/ingress-nginx/issues/1120#issuecomment-322007251
https://cloud.google.com/kubernetes-engine/docs/concepts/ingress#multiple_backend_services