Step with multi-line quoted

[p-lewis]

I have a "then" test step that looks like:

  Then lines 4-6 of ppm are
    """
    255 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 128 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 255
    """

I'm having trouble capturing the triple-quoted string. I've tried lots of things, with the most generic being:

#[then(expr = "lines {word}-{word} of {word} are{}")]
fn check_ppm_lines(world: &mut CanvasWorld, matches: &[String]) {
    println!("matches:{:?}", matches);
    assert!(false);
}

and also with a regex:
#[then(regex = r"^lines (\d+)-(\d+) of (\w+)(\n|.*)")]

I can't seem to gather any information about the expected string.

Any ideas what I can do to capture this?

[p-lewis]

I ended up finding it in the docstring of the Step. Something like this:

use cucumber::{gherkin::Step};

#[then(regex = r"lines (\d+)-(\d+) of (\w+) are")]
fn check_ppm_lines(world: &mut CanvasWorld, step: &Step, start: i32, stop: i32, ppm_name: String) {
    let docstr = step.docstring.as_ref().unwrap().as_str().trim();
}

Took me a minute to figure out that I needed gherkin::Step, not cucumber::Step.