rust – Extract values from string using regex

I am using this regex to extract 3 values from a string:

'Rgba\(\n.*\n.*?(?\d{1,3},)\n.*?(?\d{1,3},)\n.*?(?\d{1,3},)\n.*\n.*\n.*

I’m using this to capture the first 3 values and comma for first 2 values from the following output:

'Rgba(
    [
        89,
        89,
        89,
        255,
    ],
)'

I am not sure how to do this properly with split() or some other method to extract the 3 values (I don’t care if it’s all 4 values for that matter).

I am doing a capture and then a format! to join them, so I can test it contains the 3 values.

Can someone help me simplify this at all?

My current attempt is:

With the input string of:

'Rgba(
    [
        89,
        89,
        89,
        255,
    ],
)'

let mut reg_test = Regex::new(r"'Rgba\(\n.*\n.*?(?\d{1,3},)\n.*?(?\d{1,3},)\n.*?(?\d{1,3}),\n.*\n.*\n.*").unwrap();
let Some(caps) = reg_test.captures(&text_string) else {
                            println!("no match!");
                            return;
                        };
let joined_text = format!("{}{}{}", &caps["digits0"], &caps["digits1"], &caps["digits2"]).contains("0,0,0");
println!("Result: {}", joined_text);

Output is 89,89,89