routes.yml

collection:
    path: /{controller}{slash}
    defaults:
        action: collection
    requirements:
        id: "[1-9][0-9]*"
        slash: "[/]{0,1}"
    methods: [GET, POST]

resource:
    path: /{controller}/{id}{slash}
    defaults:
        action: resource
    requirements:
        id: "[1-9][0-9]*"
        slash: "[/]{0,1}"
    methods: [GET, POST, DELETE, PATCH, PUT]

resource-action:
    path: /{controller}/{id}/{action}{slash}
    defaults:
        action: resource
    requirements:
        id: "[1-9][0-9]*"
        slash: "[/]{0,1}"
    methods: [GET, POST, DELETE, PATCH, PUT]

concern-action:
    path: /{controller}/{action}{slash}
    defaults:
        action: resource
    requirements:
        action: "[a-zA-Z-_]+"
        slash: "[/]{0,1}"
    methods: [GET, POST]