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<p class='location'>Crate aho_corasick</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#types">Type Definitions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'aho_corasick', ty: 'mod', relpath: '../'};</script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>aho_corasick</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/aho_corasick/lib.rs.html#1-925' title='goto source code'>[src]</a></span></h1><div class='docblock'><p>An implementation of the
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<a href="https://en.wikipedia.org/wiki/Aho%E2%80%93Corasick_string_matching_algorithm">Aho-Corasick string search algorithm</a>.</p>
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<p>The Aho-Corasick algorithm is principally useful when you need to search many
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large texts for a fixed (possibly large) set of keywords. In particular, the
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Aho-Corasick algorithm preprocesses the set of keywords by constructing a
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finite state machine. The search phase is then a quick linear scan through the
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text. Each character in the search text causes a state transition in the
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automaton. Matches are reported when the automaton enters a match state.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>The main type exposed by this crate is <code>AcAutomaton</code>, which can be constructed
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from an iterator of pattern strings:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">aho_corasick</span>::{<span class="ident">Automaton</span>, <span class="ident">AcAutomaton</span>};
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<span class="kw">let</span> <span class="ident">aut</span> <span class="op">=</span> <span class="ident">AcAutomaton</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="string">"apple"</span>, <span class="string">"maple"</span>]);
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<span class="comment">// AcAutomaton also implements `FromIterator`:</span>
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<span class="kw">let</span> <span class="ident">aut</span>: <span class="ident">AcAutomaton</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span> <span class="op">=</span> [<span class="string">"apple"</span>, <span class="string">"maple"</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();</pre>
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<p>Finding matches can be done with <code>find</code>:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">aho_corasick</span>::{<span class="ident">Automaton</span>, <span class="ident">AcAutomaton</span>, <span class="ident">Match</span>};
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<span class="kw">let</span> <span class="ident">aut</span> <span class="op">=</span> <span class="ident">AcAutomaton</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="string">"apple"</span>, <span class="string">"maple"</span>]);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">find</span>(<span class="string">"I like maple apples."</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="ident">Match</span> {
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<span class="ident">pati</span>: <span class="number">1</span>,
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<span class="ident">start</span>: <span class="number">7</span>,
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<span class="ident">end</span>: <span class="number">12</span>,
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}));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="ident">Match</span> {
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<span class="ident">pati</span>: <span class="number">0</span>,
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<span class="ident">start</span>: <span class="number">13</span>,
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<span class="ident">end</span>: <span class="number">18</span>,
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}));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>(), <span class="prelude-val">None</span>);</pre>
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<p>Use <code>find_overlapping</code> if you want to report all matches, even if they
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overlap with each other.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">aho_corasick</span>::{<span class="ident">Automaton</span>, <span class="ident">AcAutomaton</span>, <span class="ident">Match</span>};
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<span class="kw">let</span> <span class="ident">aut</span> <span class="op">=</span> <span class="ident">AcAutomaton</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="string">"abc"</span>, <span class="string">"a"</span>]);
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<span class="kw">let</span> <span class="ident">matches</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">find_overlapping</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">matches</span>, <span class="macro">vec</span><span class="macro">!</span>[
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<span class="ident">Match</span> { <span class="ident">pati</span>: <span class="number">1</span>, <span class="ident">start</span>: <span class="number">0</span>, <span class="ident">end</span>: <span class="number">1</span>}, <span class="ident">Match</span> { <span class="ident">pati</span>: <span class="number">0</span>, <span class="ident">start</span>: <span class="number">0</span>, <span class="ident">end</span>: <span class="number">3</span> },
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]);
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<span class="comment">// Regular `find` will report only one match:</span>
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<span class="kw">let</span> <span class="ident">matches</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">find</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">matches</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Match</span> { <span class="ident">pati</span>: <span class="number">1</span>, <span class="ident">start</span>: <span class="number">0</span>, <span class="ident">end</span>: <span class="number">1</span>}]);</pre>
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<p>Finally, there are also methods for finding matches on <em>streams</em>. Namely, the
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search text does not have to live in memory. It's useful to run this on files
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that can't fit into memory:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>;
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<span class="kw">use</span> <span class="ident">aho_corasick</span>::{<span class="ident">Automaton</span>, <span class="ident">AcAutomaton</span>};
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<span class="kw">let</span> <span class="ident">aut</span> <span class="op">=</span> <span class="ident">AcAutomaton</span>::<span class="ident">new</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">"baz"</span>]);
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<span class="kw">let</span> <span class="ident">rdr</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open</span>(<span class="string">"search.txt"</span>).<span class="ident">unwrap</span>();
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<span class="kw">for</span> <span class="ident">m</span> <span class="kw">in</span> <span class="ident">aut</span>.<span class="ident">stream_find</span>(<span class="ident">rdr</span>) {
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<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">unwrap</span>(); <span class="comment">// could be an IO error</span>
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Pattern '{}' matched at: ({}, {})"</span>,
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<span class="ident">aut</span>.<span class="ident">pattern</span>(<span class="ident">m</span>.<span class="ident">pati</span>), <span class="ident">m</span>.<span class="ident">start</span>, <span class="ident">m</span>.<span class="ident">end</span>);
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}</pre>
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<p>There is also <code>stream_find_overlapping</code>, which is just like <code>find_overlapping</code>,
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but it operates on streams.</p>
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<p>Please see <code>dict-search.rs</code> in this crate's <code>examples</code> directory for a more
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complete example. It creates a large automaton from a dictionary and can do a
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streaming match over arbitrarily large data.</p>
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<h1 id="memory-usage" class="section-header"><a href="#memory-usage">Memory usage</a></h1>
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<p>A key aspect of an Aho-Corasick implementation is how the state transitions
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are represented. The easiest way to make the automaton fast is to store a
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sparse 256-slot map in each state. It maps an input byte to a state index.
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This makes the matching loop extremely fast, since it translates to a simple
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pointer read.</p>
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<p>The problem is that as the automaton accumulates more states, you end up paying
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a <code>256 * 4</code> (<code>4</code> is for the <code>u32</code> state index) byte penalty for every state
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regardless of how many transitions it has.</p>
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<p>To solve this, only states near the root of the automaton have this sparse
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map representation. States near the leaves of the automaton use a dense mapping
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that requires a linear scan.</p>
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<p>(The specific limit currently set is <code>3</code>, so that states with a depth less than
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or equal to <code>3</code> are less memory efficient. The result is that the memory usage
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of the automaton stops growing rapidly past ~60MB, even for automatons with
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thousands of patterns.)</p>
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<p>If you'd like to opt for the less-memory-efficient-but-faster version, then
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you can construct an <code>AcAutomaton</code> with a <code>Sparse</code> transition strategy:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">aho_corasick</span>::{<span class="ident">Automaton</span>, <span class="ident">AcAutomaton</span>, <span class="ident">Match</span>, <span class="ident">Sparse</span>};
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<span class="kw">let</span> <span class="ident">aut</span> <span class="op">=</span> <span class="ident">AcAutomaton</span>::<span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">Sparse</span><span class="op">></span>::<span class="ident">with_transitions</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="string">"abc"</span>, <span class="string">"a"</span>]);
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<span class="kw">let</span> <span class="ident">matches</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">find</span>(<span class="string">"abc"</span>).<span class="ident">collect</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">matches</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">Match</span> { <span class="ident">pati</span>: <span class="number">1</span>, <span class="ident">start</span>: <span class="number">0</span>, <span class="ident">end</span>: <span class="number">1</span>}]);</pre>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.AcAutomaton.html"
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title='struct aho_corasick::AcAutomaton'>AcAutomaton</a></td>
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<td class='docblock-short'>
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<p>An Aho-Corasick finite automaton.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Dense.html"
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title='struct aho_corasick::Dense'>Dense</a></td>
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<td class='docblock-short'>
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<p>State transitions that can be stored either sparsely or densely.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.FullAcAutomaton.html"
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title='struct aho_corasick::FullAcAutomaton'>FullAcAutomaton</a></td>
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<td class='docblock-short'>
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<p>A complete Aho-Corasick automaton.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Match.html"
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title='struct aho_corasick::Match'>Match</a></td>
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<td class='docblock-short'>
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<p>Records a match in the search text.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Matches.html"
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title='struct aho_corasick::Matches'>Matches</a></td>
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<td class='docblock-short'>
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<p>An iterator of non-overlapping matches for in-memory text.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.MatchesOverlapping.html"
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title='struct aho_corasick::MatchesOverlapping'>MatchesOverlapping</a></td>
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<td class='docblock-short'>
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<p>An iterator of overlapping matches for in-memory text.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Sparse.html"
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title='struct aho_corasick::Sparse'>Sparse</a></td>
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<td class='docblock-short'>
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<p>State transitions that are always sparse.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.StreamMatches.html"
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title='struct aho_corasick::StreamMatches'>StreamMatches</a></td>
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<td class='docblock-short'>
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<p>An iterator of non-overlapping matches for streaming text.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.StreamMatchesOverlapping.html"
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title='struct aho_corasick::StreamMatchesOverlapping'>StreamMatchesOverlapping</a></td>
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<td class='docblock-short'>
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<p>An iterator of overlapping matches for streaming text.</p>
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</td>
|
|||
|
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</tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
|
|||
|
|
<table>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="trait" href="trait.Automaton.html"
|
|||
|
|
title='trait aho_corasick::Automaton'>Automaton</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>An abstraction over automatons and their corresponding iterators.
|
|||
|
|
The type parameter <code>P</code> is the type of the pattern that was used to
|
|||
|
|
construct this Automaton.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="trait" href="trait.Transitions.html"
|
|||
|
|
title='trait aho_corasick::Transitions'>Transitions</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>An abstraction over state transition strategies.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr></table><h2 id='types' class='section-header'><a href="#types">Type Definitions</a></h2>
|
|||
|
|
<table>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="type" href="type.StateIdx.html"
|
|||
|
|
title='type aho_corasick::StateIdx'>StateIdx</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>The integer type used for the state index.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr></table></section>
|
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<h1 class="hidden">Help</h1>
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<div class="shortcuts">
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<h2>Keyboard Shortcuts</h2>
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<dl>
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<dt><kbd>?</kbd></dt>
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</div>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
|
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Accepted types are: <code>fn</code>, <code>mod</code>,
|
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|
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
|
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and <code>const</code>.
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</p>
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|
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<p>
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Search functions by type signature (e.g.
|
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<code>vec -> usize</code> or <code>* -> vec</code>)
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