Module tracing_core::stdlib::str::pattern

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

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

Enums

• SearchStepExperimental
  Result of calling Searcher::next() or ReverseSearcher::next_back().

Traits

• DoubleEndedSearcherExperimental
  A marker trait to express that a ReverseSearcher can be used for a DoubleEndedIterator implementation.
• PatternExperimental
  A string pattern.
• ReverseSearcherExperimental
  A reverse searcher for a string pattern.
• SearcherExperimental
  A searcher for a string pattern.