String.Extra.rightOf does not return anything past line breaks.

[RalfNorthman]

Describe the bug
String.Extra.rightOf does not return anything past line breaks. Is this the expected behavior? It confused me at least.

To Reproduce
Steps to reproduce the behavior:

Check out this Ellie:
https://ellie-app.com/s5R3HsrPbhJa1

Code block for posterity:

module Main exposing (main)

import Browser
import Html exposing (Html, div, text)
import String.Extra

type alias Model =
    { input : String
    , rightOfResult : String
    , manualSplitResult : String
    }

init : Model
init =
    let
        input = "Header\r\n<needle>\r\nData1\r\nData2\r\nData3"
        rightOfResult = String.Extra.rightOf "<needle>" input
        manualSplitResult = 
            String.split "<needle>" input
                |> List.drop 1
                |> List.head
                |> Maybe.withDefault ""
                |> String.trimLeft
    in
    { input = input
    , rightOfResult = rightOfResult
    , manualSplitResult = manualSplitResult
    }

view : Model -> Html msg
view model =
    div []
        [ div [] [ text ("Input: " ++ model.input) ]
        , div [] [ text ("String.Extra.rightOf result: " ++ model.rightOfResult) ]
        , div [] [ text ("Manual split result: " ++ model.manualSplitResult) ]
        ]

main : Program () Model msg
main =
    Browser.sandbox
        { init = init
        , view = view
        , update = \_ model -> model
        }

Expected behavior
I expect rightOf to return everything after the match, regardless of line breaks.

Additional context

The siblings of rightOf probably have the same issue.

I think this behavior could be inherited from the underlying regex package with the use of $ which matches on line end. I have not checked if this is the case though.