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Apache Lucene - Query Parser Syntax
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<h1>
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Apache Lucene - Query Parser Syntax
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</h1>
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<div id="minitoc-area">
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<ul class="minitoc">
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<li>
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<a href="#Overview">Overview</a>
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</li>
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<li>
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<a href="#Terms">Terms</a>
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</li>
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<li>
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<a href="#Fields">Fields</a>
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</li>
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<li>
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<a href="#Term Modifiers">Term Modifiers</a>
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<ul class="minitoc">
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<li>
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<a href="#Wildcard Searches">Wildcard Searches</a>
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</li>
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<li>
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<a href="#Fuzzy Searches">Fuzzy Searches</a>
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</li>
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<li>
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<a href="#Proximity Searches">Proximity Searches</a>
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</li>
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<li>
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<a href="#Range Searches">Range Searches</a>
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</li>
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<li>
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<a href="#Boosting a Term">Boosting a Term</a>
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</li>
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</ul>
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</li>
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<li>
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<a href="#Boolean operators">Boolean Operators</a>
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<ul class="minitoc">
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<li>
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<a href="#OR"></a>
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</li>
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<li>
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<a href="#AND">AND</a>
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</li>
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<li>
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<a href="#+">+</a>
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<li>
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<a href="#NOT">NOT</a>
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</li>
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<a href="#-">-</a>
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</ul>
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<li>
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<a href="#Grouping">Grouping</a>
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</li>
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<li>
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<a href="#Field Grouping">Field Grouping</a>
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</li>
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<li>
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<a href="#Escaping Special Characters">Escaping Special Characters</a>
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</li>
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</ul>
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</div>
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<a name="N10013"></a><a name="Overview"></a>
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<h2 class="boxed">Overview</h2>
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<div class="section">
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<p>Although Lucene provides the ability to create your own
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queries through its API, it also provides a rich query
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language through the Query Parser, a lexer which
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interprets a string into a Lucene Query using JavaCC.
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</p>
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<p>This page provides the Query Parser syntax in Lucene 1.9.
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If you are using a different
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version of Lucene, please consult the copy of
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<span class="codefrag">docs/queryparsersyntax.html</span> that was distributed
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with the version you are using.
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</p>
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<p>
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Before choosing to use the provided Query Parser, please consider the following:
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<ol>
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<li>If you are programmatically generating a query string and then
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parsing it with the query parser then you should seriously consider building
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your queries directly with the query API. In other words, the query
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parser is designed for human-entered text, not for program-generated
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text.</li>
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<li>Untokenized fields are best added directly to queries, and not
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through the query parser. If a field's values are generated programmatically
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by the application, then so should query clauses for this field.
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An analyzer, which the query parser uses, is designed to convert human-entered
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text to terms. Program-generated values, like dates, keywords, etc.,
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should be consistently program-generated.</li>
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<li>In a query form, fields which are general text should use the query
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parser. All others, such as date ranges, keywords, etc. are better added
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directly through the query API. A field with a limit set of values,
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that can be specified with a pull-down menu should not be added to a
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query string which is subsequently parsed, but rather added as a
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TermQuery clause.</li>
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</ol>
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</p>
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</div>
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<a name="N10032"></a><a name="Terms"></a>
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<h2 class="boxed">Terms</h2>
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<div class="section">
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<p>A query is broken up into terms and operators. There are two types of terms: Single Terms and Phrases.</p>
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<p>A Single Term is a single word such as "test" or "hello".</p>
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<p>A Phrase is a group of words surrounded by double quotes such as "hello dolly".</p>
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<p>Multiple terms can be combined together with Boolean operators to form a more complex query (see below).</p>
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<p>Note: The analyzer used to create the index will be used on the terms and phrases in the query string.
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So it is important to choose an analyzer that will not interfere with the terms used in the query string.</p>
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</div>
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<a name="N10048"></a><a name="Fields"></a>
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<h2 class="boxed">Fields</h2>
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<div class="section">
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<p>Lucene supports fielded data. When performing a search you can either specify a field, or use the default field. The field names and default field is implementation specific.</p>
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<p>You can search any field by typing the field name followed by a colon ":" and then the term you are looking for. </p>
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<p>As an example, let's assume a Lucene index contains two fields, title and text and text is the default field.
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If you want to find the document entitled "The Right Way" which contains the text "don't go this way", you can enter: </p>
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<pre class="code">title:"The Right Way" AND text:go</pre>
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<p>or</p>
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<pre class="code">title:"Do it right" AND right</pre>
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<p>Since text is the default field, the field indicator is not required.</p>
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<p>Note: The field is only valid for the term that it directly precedes, so the query</p>
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<pre class="code">title:Do it right</pre>
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<p>Will only find "Do" in the title field. It will find "it" and "right" in the default field (in this case the text field). </p>
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</div>
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<a name="N1006D"></a><a name="Term Modifiers"></a>
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<h2 class="boxed">Term Modifiers</h2>
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<div class="section">
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<p>Lucene supports modifying query terms to provide a wide range of searching options.</p>
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<a name="N10076"></a><a name="Wildcard Searches"></a>
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<h3 class="boxed">Wildcard Searches</h3>
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<p>Lucene supports single and multiple character wildcard searches within single terms
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(not within phrase queries).</p>
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<p>To perform a single character wildcard search use the "?" symbol.</p>
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<p>To perform a multiple character wildcard search use the "*" symbol.</p>
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<p>The single character wildcard search looks for terms that match that with the single character replaced. For example, to search for "text" or "test" you can use the search:</p>
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<pre class="code">te?t</pre>
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<p>Multiple character wildcard searches looks for 0 or more characters. For example, to search for test, tests or tester, you can use the search: </p>
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<pre class="code">test*</pre>
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<p>You can also use the wildcard searches in the middle of a term.</p>
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<pre class="code">te*t</pre>
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<p>Note: You cannot use a * or ? symbol as the first character of a search.</p>
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<a name="N1009B"></a><a name="Fuzzy Searches"></a>
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<h3 class="boxed">Fuzzy Searches</h3>
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<p>Lucene supports fuzzy searches based on the Levenshtein Distance, or Edit Distance algorithm. To do a fuzzy search use the tilde, "~", symbol at the end of a Single word Term. For example to search for a term similar in spelling to "roam" use the fuzzy search: </p>
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<pre class="code">roam~</pre>
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<p>This search will find terms like foam and roams.</p>
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<p>Starting with Lucene 1.9 an additional (optional) parameter can specify the required similarity. The value is between 0 and 1, with a value closer to 1 only terms with a higher similarity will be matched. For example:</p>
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<pre class="code">roam~0.8</pre>
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<p>The default that is used if the parameter is not given is 0.5.</p>
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<a name="N100B4"></a><a name="Proximity Searches"></a>
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<h3 class="boxed">Proximity Searches</h3>
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<p>Lucene supports finding words are a within a specific distance away. To do a proximity search use the tilde, "~", symbol at the end of a Phrase. For example to search for a "apache" and "jakarta" within 10 words of each other in a document use the search: </p>
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<pre class="code">"jakarta apache"~10</pre>
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<a name="N100C1"></a><a name="Range Searches"></a>
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<h3 class="boxed">Range Searches</h3>
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<p>Range Queries allow one to match documents whose field(s) values
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are between the lower and upper bound specified by the Range Query.
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Range Queries can be inclusive or exclusive of the upper and lower bounds.
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Sorting is done lexicographically.</p>
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<pre class="code">mod_date:[20020101 TO 20030101]</pre>
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<p>This will find documents whose mod_date fields have values between 20020101 and 20030101, inclusive.
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Note that Range Queries are not reserved for date fields. You could also use range queries with non-date fields:</p>
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<pre class="code">title:{Aida TO Carmen}</pre>
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<p>This will find all documents whose titles are between Aida and Carmen, but not including Aida and Carmen.</p>
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<p>Inclusive range queries are denoted by square brackets. Exclusive range queries are denoted by
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curly brackets.</p>
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<a name="N100DA"></a><a name="Boosting a Term"></a>
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<h3 class="boxed">Boosting a Term</h3>
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<p>Lucene provides the relevance level of matching documents based on the terms found. To boost a term use the caret, "^", symbol with a boost factor (a number) at the end of the term you are searching. The higher the boost factor, the more relevant the term will be.</p>
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<p>Boosting allows you to control the relevance of a document by boosting its term. For example, if you are searching for</p>
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<pre class="code">jakarta apache</pre>
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<p>and you want the term "jakarta" to be more relevant boost it using the ^ symbol along with the boost factor next to the term.
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You would type:</p>
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<pre class="code">jakarta^4 apache</pre>
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<p>This will make documents with the term jakarta appear more relevant. You can also boost Phrase Terms as in the example: </p>
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<pre class="code">"jakarta apache"^4 "Apache Lucene"</pre>
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<p>By default, the boost factor is 1. Although the boost factor must be positive, it can be less than 1 (e.g. 0.2)</p>
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</div>
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<a name="N100FA"></a><a name="Boolean operators"></a>
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<h2 class="boxed">Boolean Operators</h2>
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<div class="section">
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<p>Boolean operators allow terms to be combined through logic operators.
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Lucene supports AND, "+", OR, NOT and "-" as Boolean operators(Note: Boolean operators must be ALL CAPS).</p>
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<a name="N10103"></a><a name="OR"></a>
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<h3 class="boxed"></h3>
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<p>The OR operator is the default conjunction operator. This means that if there is no Boolean operator between two terms, the OR operator is used.
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The OR operator links two terms and finds a matching document if either of the terms exist in a document. This is equivalent to a union using sets.
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The symbol || can be used in place of the word OR.</p>
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<p>To search for documents that contain either "jakarta apache" or just "jakarta" use the query:</p>
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<pre class="code">"jakarta apache" jakarta</pre>
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<p>or</p>
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<pre class="code">"jakarta apache" OR jakarta</pre>
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<a name="N10116"></a><a name="AND"></a>
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<h3 class="boxed">AND</h3>
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<p>The AND operator matches documents where both terms exist anywhere in the text of a single document.
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This is equivalent to an intersection using sets. The symbol && can be used in place of the word AND.</p>
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<p>To search for documents that contain "jakarta apache" and "Apache Lucene" use the query: </p>
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<pre class="code">"jakarta apache" AND "Apache Lucene"</pre>
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<a name="N10126"></a><a name="+"></a>
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<h3 class="boxed">+</h3>
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<p>The "+" or required operator requires that the term after the "+" symbol exist somewhere in a the field of a single document.</p>
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<p>To search for documents that must contain "jakarta" and may contain "lucene" use the query:</p>
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<pre class="code">+jakarta lucene</pre>
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<a name="N10136"></a><a name="NOT"></a>
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<h3 class="boxed">NOT</h3>
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<p>The NOT operator excludes documents that contain the term after NOT.
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This is equivalent to a difference using sets. The symbol ! can be used in place of the word NOT.</p>
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<p>To search for documents that contain "jakarta apache" but not "Apache Lucene" use the query: </p>
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<pre class="code">"jakarta apache" NOT "Apache Lucene"</pre>
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<p>Note: The NOT operator cannot be used with just one term. For example, the following search will return no results:</p>
|
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<pre class="code">NOT "jakarta apache"</pre>
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<a name="N1014C"></a><a name="-"></a>
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<h3 class="boxed">-</h3>
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|
<p>The "-" or prohibit operator excludes documents that contain the term after the "-" symbol.</p>
|
|
<p>To search for documents that contain "jakarta apache" but not "Apache Lucene" use the query: </p>
|
|
<pre class="code">"jakarta apache" -"Apache Lucene"</pre>
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</div>
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<a name="N1015D"></a><a name="Grouping"></a>
|
|
<h2 class="boxed">Grouping</h2>
|
|
<div class="section">
|
|
<p>Lucene supports using parentheses to group clauses to form sub queries. This can be very useful if you want to control the boolean logic for a query.</p>
|
|
<p>To search for either "jakarta" or "apache" and "website" use the query:</p>
|
|
<pre class="code">(jakarta OR apache) AND website</pre>
|
|
<p>This eliminates any confusion and makes sure you that website must exist and either term jakarta or apache may exist.</p>
|
|
</div>
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<a name="N10170"></a><a name="Field Grouping"></a>
|
|
<h2 class="boxed">Field Grouping</h2>
|
|
<div class="section">
|
|
<p>Lucene supports using parentheses to group multiple clauses to a single field.</p>
|
|
<p>To search for a title that contains both the word "return" and the phrase "pink panther" use the query:</p>
|
|
<pre class="code">title:(+return +"pink panther")</pre>
|
|
</div>
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|
|
<a name="N10180"></a><a name="Escaping Special Characters"></a>
|
|
<h2 class="boxed">Escaping Special Characters</h2>
|
|
<div class="section">
|
|
<p>Lucene supports escaping special characters that are part of the query syntax. The current list special characters are</p>
|
|
<p>+ - && || ! ( ) { } [ ] ^ " ~ * ? : \</p>
|
|
<p>To escape these character use the \ before the character. For example to search for (1+1):2 use the query:</p>
|
|
<pre class="code">\(1\+1\)\:2</pre>
|
|
</div>
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</div>
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