Anchors and Boundaries

Match positions in the string.

String Anchors

fn main() {
    use fuzzy_regex::FuzzyRegex;

    // Match at start
    let re1 = FuzzyRegex::new("^hello").unwrap();
    assert!(re1.is_match("hello world"));
    assert!(!re1.is_match("say hello"));

    // Match at end
    let re2 = FuzzyRegex::new("hello$").unwrap();
    assert!(re2.is_match("say hello"));
    assert!(!re2.is_match("hello world"));

    // Match entire string
    let re3 = FuzzyRegex::new("^hello$").unwrap();
    assert!(re3.is_match("hello"));
    assert!(!re3.is_match("hello world"));
}

Word Boundaries

fn main() {
    use fuzzy_regex::FuzzyRegex;

    // Match whole word "cat"
    let re1 = FuzzyRegex::new(r"\bcat\b").unwrap();
    assert!(re1.is_match("cat"));
    assert!(re1.is_match("the cat sat"));
    assert!(!re1.is_match("category"));

    // Match "cat" not at word boundary
    let re2 = FuzzyRegex::new(r"\Bcat\B").unwrap();
    assert!(re2.is_match("category"));
    assert!(!re2.is_match("cat"));
}

Multi-line Mode

With (?m), ^ and $ match line boundaries:

fn main() {
    use fuzzy_regex::FuzzyRegex;

    let re = FuzzyRegex::new("(?m)^hello$").unwrap();
    let text = "hello\nhello\nhello";
    let matches: Vec<_> = re.find_iter(text).collect();
    assert_eq!(matches.len(), 3);
}