How to capture a multi-line string in a step?

[jmevel]

Hello !

Consider the following scenario

Scenario: Just a test
    When this
    """
    is
    a
    test
    """
    Then I can capture a multi-line string

Is is possible to capture such string with cucumber-rs?

I've tried several things like

#[when(expr = "this")]
fn test(world: &mut MyWorld, content: String) {}

or

#[when(expr = "this{}")]
fn test(world: &mut MyWorld, content: String) {}

or even

#[when(expr = "this\n{}")]
fn test(world: &mut MyWorld, content: String) {}

But nothing is working.
Or maybe there's a way with a Regex instead of a cucumber expression?
I'm wondering if this is actually supported by cucumber-rs (I hope it is)

Thanks for your answer(s) 🙏

[tyranron]

@jmevel we have this topic covered in the "Doc strings" chapter of the Book:

Feature: Animal feature
   
  Scenario: If we feed a hungry cat it will no longer be hungry
    Given a hungry cat
      """
      A hungry cat called Felix is rescued from a Whiskas tin in a calamitous 
      mash-up of cat food brands.
      """
    When I feed the cat
    Then the cat is not hungry

In a step matching function, there’s no need to find this text and match it with a pattern. Instead, it may be accessed via Step argument:

#[given(regex = r"^a (hungry|satiated) cat$")]
async fn hungry_cat(world: &mut AnimalWorld, step: &Step, state: String) {
    // Feed only Leo and Felix.
    if !step
        .docstring
        .as_ref()
        .map_or(false, |text| text.contains("Felix") || text.contains("Leo"))
    {
        panic!("Only Felix and Leo can be fed");
    }

    match state.as_str() {
        "hungry" => world.cat.hungry = true,
        "satiated" => world.cat.hungry = false,
        _ => unreachable!(),
    }
}

[jmevel]

Ah! Thanks again for your very fast answer.
I went through the whole docs but I think I completely erased this part from my mind as I didn't think I'd ever need to know that...
I didn't even know this was called Doc strings actually.

So glad cucumber-rs has a way to deal with this.
Thanks a lot ✌️