core::str

Module pattern

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🔬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 the str type.

§Examples

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));

Structs§

  • CharArrayRefSearcherExperimental
    Associated type for <&[char; N] as Pattern>::Searcher<'a>.
  • CharArraySearcherExperimental
    Associated type for <[char; N] as Pattern>::Searcher<'a>.
  • CharPredicateSearcherExperimental
    Associated type for <F as Pattern>::Searcher<'a>.
  • CharSearcherExperimental
    Associated type for <char as Pattern>::Searcher<'a>.
  • CharSliceSearcherExperimental
    Associated type for <&[char] as Pattern>::Searcher<'a>.
  • StrSearcherExperimental
    Associated type for <&str as Pattern>::Searcher<'a>.

Enums§

Traits§