# [−][src]Trait alloc::str::pattern::Pattern

    pub trait Pattern<'a> {
        type Searcher: Searcher<'a>;
        fn into_searcher(self, haystack: &'a str) -> Self::Searcher;

        fn is_contained_in(self, haystack: &'a str) -> bool { ... }
        fn is_prefix_of(self, haystack: &'a str) -> bool { ... }
        fn is_suffix_of(self, haystack: &'a str) -> bool
        where
            Self::Searcher: ReverseSearcher<'a>,
        { ... }
    }

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

API not fully fleshed out and ready to be stabilized

A string pattern.

A `Pattern<'a>` expresses that the implementing type can be used as a string pattern for searching in a `&'a str`.

For example, both `'a'` and `"aa"` are patterns that would match at index `1` in the string `"baaaab"`.

The trait itself acts as a builder for an associated `Searcher` type, which does the actual work of finding occurrences of the pattern in a string.

## Associated Types

### `type Searcher: Searcher<'a>`

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

API not fully fleshed out and ready to be stabilized

Associated searcher for this pattern

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## Required methods

### `fn into_searcher(self, haystack: &'a str) -> Self::Searcher`

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

API not fully fleshed out and ready to be stabilized

Constructs the associated searcher from `self` and the `haystack` to search in.

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## Provided methods

### `fn is_contained_in(self, haystack: &'a str) -> bool`

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

API not fully fleshed out and ready to be stabilized

Checks whether the pattern matches anywhere in the haystack

### `fn is_prefix_of(self, haystack: &'a str) -> bool`

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

API not fully fleshed out and ready to be stabilized

Checks whether the pattern matches at the front of the haystack

### `fn is_suffix_of(self, haystack: &'a str) -> bool where
Self::Searcher: ReverseSearcher<'a>,`

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

API not fully fleshed out and ready to be stabilized

Checks whether the pattern matches at the back of the haystack

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## Implementors

### `impl<'a> Pattern<'a> for char`[src]

Searches for chars that are equal to a given char

#### `type Searcher = CharSearcher<'a>`

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

API not fully fleshed out and ready to be stabilized

#### `fn into_searcher(self, haystack: &'a str) -> <char as Pattern<'a>>::Searcher`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_contained_in(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_prefix_of(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_suffix_of(self, haystack: &'a str) -> bool where
<char as Pattern<'a>>::Searcher: ReverseSearcher<'a>,` [src]

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

API not fully fleshed out and ready to be stabilized

### `impl<'a, 'b> Pattern<'a> for &'b String`[src]

A convenience impl that delegates to the impl for `&str`

#### `type Searcher = <&'b str as Pattern<'a>>::Searcher`

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

API not fully fleshed out and ready to be stabilized

#### `fn into_searcher(self, haystack: &'a str) -> <&'b str as Pattern<'a>>::Searcher`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_contained_in(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_prefix_of(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

### `impl<'a, 'b> Pattern<'a> for &'b [char]`[src]

Searches for chars that are equal to any of the chars in the array

#### `type Searcher = CharSliceSearcher<'a, 'b>`

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

API not fully fleshed out and ready to be stabilized

#### `fn into_searcher(self, haystack: &'a str) -> CharSliceSearcher<'a, 'b>`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_contained_in(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_prefix_of(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_suffix_of(self, haystack: &'a str) -> bool where
CharSliceSearcher<'a, 'b>: ReverseSearcher<'a>,` [src]

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

API not fully fleshed out and ready to be stabilized

### `impl<'a, 'b> Pattern<'a> for &'b str`[src]

Non-allocating substring search.

Will handle the pattern `""` as returning empty matches at each character boundary.

#### `type Searcher = StrSearcher<'a, 'b>`

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

API not fully fleshed out and ready to be stabilized

#### `fn into_searcher(self, haystack: &'a str) -> StrSearcher<'a, 'b>`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_prefix_of(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

Checks whether the pattern matches at the front of the haystack

#### `fn is_suffix_of(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

Checks whether the pattern matches at the back of the haystack

### `impl<'a, 'b, 'c> Pattern<'a> for &'c &'b str`[src]

Delegates to the `&str` impl.

#### `type Searcher = StrSearcher<'a, 'b>`

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

API not fully fleshed out and ready to be stabilized

#### `fn into_searcher(self, haystack: &'a str) -> StrSearcher<'a, 'b>`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_contained_in(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_prefix_of(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_suffix_of(self, haystack: &'a str) -> bool where
StrSearcher<'a, 'b>: ReverseSearcher<'a>,` [src]

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

API not fully fleshed out and ready to be stabilized

### `impl<'a, F> Pattern<'a> for F where
F: FnMut(char) -> bool,` [src]

Searches for chars that match the given predicate

#### `type Searcher = CharPredicateSearcher<'a, F>`

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

API not fully fleshed out and ready to be stabilized

#### `fn into_searcher(self, haystack: &'a str) -> CharPredicateSearcher<'a, F>`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_contained_in(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_prefix_of(self, haystack: &'a str) -> bool`[src]

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

API not fully fleshed out and ready to be stabilized

#### `fn is_suffix_of(self, haystack: &'a str) -> bool where
CharPredicateSearcher<'a, F>: ReverseSearcher<'a>,` [src]

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

API not fully fleshed out and ready to be stabilized

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