Function get 

pub fn get(string: &str, pattern: &str) -> Result<u64, Box<Error>>

Calculates the specificity of a pattern against a given string.

This function assumes that the string provided is already a full match for the pattern. If the pattern does not match the string, the resulting specificity will be mathematically inconsistent and meaningless for comparison purposes.

let string = "abc";
let high = get(string, "abc").unwrap();
let low = get(string, ".*").unwrap();
 
assert!(high > low);

Examples found in repository

examples/counterintuitive.rs (line 10)

fn main() {
    let string = "cat";

    let pattern1 = r".*";
    let pattern2 = r".*a.*";

    assert_eq!(
        get(string, pattern1).unwrap(),
        get(string, pattern2).unwrap()
    )
}

examples/sort.rs (line 16)

fn main() {
    let string = "alice@myprovider.com";

    // You must ensure that the pattern fully matches the string before calling
    let patterns = vec![
        r".*",
        r"[a-z]+@[a-z]+\.[a-z]+",
        r"alice@[a-z]+\.[a-z]+",
    ];

    let mut results: Vec<(&str, u64)> = Vec::new();

    for pattern in patterns {
        if let Ok(score) = get(string, pattern) {
            results.push((pattern, score));
        }
    }

    results.sort_by(|(_, a), (_, b)| b.cmp(a));

    print(string, results);
}