🔬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§
- CharArray RefSearcher Experimental 
- Associated type for <&[char; N] as Pattern>::Searcher<'a>.
- CharArray Searcher Experimental 
- Associated type for <[char; N] as Pattern>::Searcher<'a>.
- CharPredicate Searcher Experimental 
- Associated type for <F as Pattern>::Searcher<'a>.
- CharSearcher Experimental 
- Associated type for <char as Pattern>::Searcher<'a>.
- CharSlice Searcher Experimental 
- Associated type for <&[char] as Pattern>::Searcher<'a>.
- StrSearcherExperimental 
- Associated type for <&str as Pattern>::Searcher<'a>.
Enums§
- SearchStep Experimental 
- Result of calling Searcher::next()orReverseSearcher::next_back().
- Utf8Pattern Experimental 
- Result of calling Pattern::as_utf8_pattern(). Can be used for inspecting the contents of aPatternin cases where the underlying representation can be represented as UTF-8.
Traits§
- DoubleEnded Searcher Experimental 
- A marker trait to express that a ReverseSearchercan be used for aDoubleEndedIteratorimplementation.
- PatternExperimental 
- A string pattern.
- ReverseSearcher Experimental 
- A reverse searcher for a string pattern.
- SearcherExperimental 
- A searcher for a string pattern.