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<h2 class="title"><a id="analysis-pattern-analyzer"></a>Pattern Analyzer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.1/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc">edit</a></h2>
</div></div></div>
<p>An analyzer of type <code class="literal">pattern</code> that can flexibly separate text into terms
via a regular expression. Accepts the following settings:</p>
<p>The following are settings that can be set for a <code class="literal">pattern</code> analyzer
type:</p>
<div class="informaltable">
<table border="0" cellpadding="4px">
<colgroup>
<col/>
<col/>
</colgroup>
<tbody valign="top">
<tr>
<td valign="top">
<p>
<code class="literal">lowercase</code>
</p>
</td>
<td valign="top">
<p>
Should terms be lowercased or not. Defaults to <code class="literal">true</code>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">pattern</code>
</p>
</td>
<td valign="top">
<p>
The regular expression pattern, defaults to <code class="literal">\W+</code>.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">flags</code>
</p>
</td>
<td valign="top">
<p>
The regular expression flags.
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">stopwords</code>
</p>
</td>
<td valign="top">
<p>
A list of stopwords to initialize the stop filter with.
Defaults to an <em>empty</em> stopword list Check
<a class="xref" href="analysis-stop-analyzer.html" title="Stop Analyzer">Stop Analyzer</a> for more details.
</p>
</td>
</tr>
</tbody>
</table>
</div>
<p><span class="strong strong"><strong>IMPORTANT</strong></span>: The regular expression should match the <span class="strong strong"><strong>token separators</strong></span>,
not the tokens themselves.</p>
<p>Flags should be pipe-separated, eg <code class="literal">"CASE_INSENSITIVE|COMMENTS"</code>. Check
<a href="http://download.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html#field_summary" class="ulink" target="_top">Java
Pattern API</a> for more details about <code class="literal">flags</code> options.</p>
<h4><a id="_pattern_analyzer_examples"></a>Pattern Analyzer Examples<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.1/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc">edit</a></h4>
<p>In order to try out these examples, you should delete the <code class="literal">test</code> index
before running each example.</p>
<h5><a id="_whitespace_tokenizer"></a>Whitespace tokenizer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.1/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc">edit</a></h5>
<div class="pre_wrapper lang-sense">
<pre class="programlisting prettyprint lang-sense">DELETE test
PUT /test
{
"settings": {
"analysis": {
"analyzer": {
"whitespace": {
"type": "pattern",
"pattern": "\\s+"
}
}
}
}
}
GET /test/_analyze?analyzer=whitespace&text=foo,bar baz
# "foo,bar", "baz"</pre>
</div>
<div class="sense_widget" data-snippet="snippets/128.sense"></div>
<h5><a id="_non_word_character_tokenizer"></a>Non-word character tokenizer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.1/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc">edit</a></h5>
<div class="pre_wrapper lang-sense">
<pre class="programlisting prettyprint lang-sense">DELETE test
PUT /test
{
"settings": {
"analysis": {
"analyzer": {
"nonword": {
"type": "pattern",
"pattern": "[^\\w]+" <a id="CO221-1"></a><i class="conum" data-value="1"></i>
}
}
}
}
}
GET /test/_analyze?analyzer=nonword&text=foo,bar baz
# "foo,bar baz" becomes "foo", "bar", "baz"
GET /test/_analyze?analyzer=nonword&text=type_1-type_4
# "type_1","type_4"</pre>
</div>
<div class="sense_widget" data-snippet="snippets/129.sense"></div>
<h5><a id="_camelcase_tokenizer"></a>CamelCase tokenizer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.1/docs/reference/analysis/analyzers/pattern-analyzer.asciidoc">edit</a></h5>
<div class="pre_wrapper lang-sense">
<pre class="programlisting prettyprint lang-sense">DELETE test
PUT /test?pretty=1
{
"settings": {
"analysis": {
"analyzer": {
"camel": {
"type": "pattern",
"pattern": "([^\\p{L}\\d]+)|(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)|(?<=[\\p{L}&&[^\\p{Lu}]])(?=\\p{Lu})|(?<=\\p{Lu})(?=\\p{Lu}[\\p{L}&&[^\\p{Lu}]])"
}
}
}
}
}
GET /test/_analyze?analyzer=camel&text=MooseX::FTPClass2_beta
# "moose","x","ftp","class","2","beta"</pre>
</div>
<div class="sense_widget" data-snippet="snippets/130.sense"></div>
<p>The regex above is easier to understand as:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js"> ([^\p{L}\d]+) # swallow non letters and numbers,
| (?<=\D)(?=\d) # or non-number followed by number,
| (?<=\d)(?=\D) # or number followed by non-number,
| (?<=[ \p{L} && [^\p{Lu}]]) # or lower case
(?=\p{Lu}) # followed by upper case,
| (?<=\p{Lu}) # or upper case
(?=\p{Lu} # followed by upper case
[\p{L}&&[^\p{Lu}]] # then lower case
)</pre>
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