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<h2 class="title"><a id="analysis-edgengram-tokenizer"></a>Edge NGram 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/2.2/docs/reference/analysis/tokenizers/edgengram-tokenizer.asciidoc">edit</a></h2>
</div></div></div>
<p>A tokenizer of type <code class="literal">edgeNGram</code>.</p>
<p>This tokenizer is very similar to <code class="literal">nGram</code> but only keeps n-grams which
start at the beginning of a token.</p>
<p>The following are settings that can be set for a <code class="literal">edgeNGram</code> tokenizer
type:</p>
<div class="informaltable">
<table border="1" cellpadding="4px">
<colgroup>
<col class="col_1"/>
<col class="col_2"/>
<col class="col_3"/>
</colgroup>
<thead>
<tr>
<th align="left" valign="top">Setting</th>
<th align="left" valign="top">Description</th>
<th align="left" valign="top">Default value</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p><code class="literal">min_gram</code></p></td>
<td align="left" valign="top"><p>Minimum size in codepoints of a single n-gram</p></td>
<td align="left" valign="top"><p><code class="literal">1</code>.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">max_gram</code></p></td>
<td align="left" valign="top"><p>Maximum size in codepoints of a single n-gram</p></td>
<td align="left" valign="top"><p><code class="literal">2</code>.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">token_chars</code></p></td>
<td align="left" valign="top"><p>Characters classes to keep in the
tokens, Elasticsearch will split on characters that don’t belong to any
of these classes.</p></td>
<td align="left" valign="top"><p><code class="literal">[]</code> (Keep all characters)</p></td>
</tr>
</tbody>
</table>
</div>
<p><code class="literal">token_chars</code> accepts the following character classes:</p>
<div class="informaltable">
<table border="0" cellpadding="4px">
<colgroup>
<col/>
<col/>
</colgroup>
<tbody valign="top">
<tr>
<td valign="top">
<p>
<code class="literal">letter</code>
</p>
</td>
<td valign="top">
<p>
for example <code class="literal">a</code>, <code class="literal">b</code>, <code class="literal">ï</code> or <code class="literal">京</code>
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">digit</code>
</p>
</td>
<td valign="top">
<p>
for example <code class="literal">3</code> or <code class="literal">7</code>
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">whitespace</code>
</p>
</td>
<td valign="top">
<p>
for example <code class="literal">" "</code> or <code class="literal">"\n"</code>
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">punctuation</code>
</p>
</td>
<td valign="top">
<p>
for example <code class="literal">!</code> or <code class="literal">"</code>
</p>
</td>
</tr>
<tr>
<td valign="top">
<p>
<code class="literal">symbol</code>
</p>
</td>
<td valign="top">
<p>
for example <code class="literal">$</code> or <code class="literal">√</code>
</p>
</td>
</tr>
</tbody>
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</div>
<h4><a id="_example_5"></a>Example<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.2/docs/reference/analysis/tokenizers/edgengram-tokenizer.asciidoc">edit</a></h4>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js"> curl -XPUT 'localhost:9200/test' -d '
{
"settings" : {
"analysis" : {
"analyzer" : {
"my_edge_ngram_analyzer" : {
"tokenizer" : "my_edge_ngram_tokenizer"
}
},
"tokenizer" : {
"my_edge_ngram_tokenizer" : {
"type" : "edgeNGram",
"min_gram" : "2",
"max_gram" : "5",
"token_chars": [ "letter", "digit" ]
}
}
}
}
}'
curl 'localhost:9200/test/_analyze?pretty=1&analyzer=my_edge_ngram_analyzer' -d 'FC Schalke 04'
# FC, Sc, Sch, Scha, Schal, 04</pre>
</div>
<h4><a id="_literal_side_literal_deprecated"></a><code class="literal">side</code> deprecated<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.2/docs/reference/analysis/tokenizers/edgengram-tokenizer.asciidoc">edit</a></h4>
<p>There used to be a <code class="literal">side</code> parameter up to <code class="literal">0.90.1</code> but it is now deprecated. In
order to emulate the behavior of <code class="literal">"side" : "BACK"</code> a
<a class="xref" href="analysis-reverse-tokenfilter.html" title="Reverse Token Filter"><code class="literal">reverse</code> token filter</a> should be used together
with the <a class="xref" href="analysis-edgengram-tokenfilter.html" title="Edge NGram Token Filter"><code class="literal">edgeNGram</code> token filter</a>. The
<code class="literal">edgeNGram</code> filter must be enclosed in <code class="literal">reverse</code> filters like this:</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js"> "filter" : ["reverse", "edgeNGram", "reverse"]</pre>
</div>
<p>which essentially reverses the token, builds front <code class="literal">EdgeNGrams</code> and reverses
the ngram again. This has the same effect as the previous <code class="literal">"side" : "BACK"</code> setting.</p>
</div>
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