🔬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§
- Char
Array RefSearcher Experimental Associated type for<&[char; N] as Pattern>::Searcher<'a>
. - Char
Array Searcher Experimental Associated type for<[char; N] as Pattern>::Searcher<'a>
. - Char
Predicate Searcher Experimental Associated type for<F as Pattern>::Searcher<'a>
. - Char
Searcher Experimental Associated type for<char as Pattern>::Searcher<'a>
. - Char
Slice Searcher Experimental Associated type for<&[char] as Pattern>::Searcher<'a>
. - StrSearcher
Experimental Associated type for<&str as Pattern>::Searcher<'a>
.
Enums§
- Search
Step Experimental Result of callingSearcher::next()
orReverseSearcher::next_back()
.
Traits§
- Double
Ended Searcher Experimental A marker trait to express that aReverseSearcher
can be used for aDoubleEndedIterator
implementation. - Pattern
Experimental A string pattern. - Reverse
Searcher Experimental A reverse searcher for a string pattern. - Searcher
Experimental A searcher for a string pattern.