std::str::pattern - Rust (original) (raw)

🔬 This is a nightly-only experimental API. (pattern #27721)

Expand description

The string Pattern API.

The Pattern API provides a generic mechanism for using different pattern types when searching through a string.

For more details, see the traits Pattern, Searcher,ReverseSearcher, and DoubleEndedSearcher.

Although this API is unstable, it is exposed via stable APIs on thestr type.

Pattern is implemented in the stable API for&str, char, slices of char, and functions and closures implementing FnMut(char) -> bool.

let s = "Can you find a needle in a haystack?";

// &str pattern
assert_eq!(s.find("you"), Some(4));
// char pattern
assert_eq!(s.find('n'), Some(2));
// array of chars pattern
assert_eq!(s.find(&['a', 'e', 'i', 'o', 'u']), Some(1));
// slice of chars pattern
assert_eq!(s.find(&['a', 'e', 'i', 'o', 'u'][..]), Some(1));
// closure pattern
assert_eq!(s.find(|c: char| c.is_ascii_punctuation()), Some(35));

Run

Associated type for <&[char; N] as Pattern<'a>>::Searcher.

Associated type for <[char; N] as Pattern<'a>>::Searcher.

Associated type for <F as Pattern<'a>>::Searcher.

Associated type for <char as Pattern<'a>>::Searcher.

Associated type for <&[char] as Pattern<'a>>::Searcher.

Associated type for <&str as Pattern<'a>>::Searcher.

A reverse searcher for a string pattern.

A searcher for a string pattern.