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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-9933] Explain that regex is unable to take advantage of indexes that use collation</title>
                <link>https://jira.mongodb.org/browse/DOCS-9933</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;With the release of 3.4 we introduced collations. Among other benefits, that allows MongoDB users to create case-insensitive indexes.&lt;/p&gt;

&lt;p&gt;Some of these users (not unreasonably) expect that &lt;tt&gt;$regex&lt;/tt&gt; case insensitive queries should be able take advantage of such indexes. Unfortunately that is not the case - the &lt;tt&gt;regex&lt;/tt&gt; implementation is not collation-aware and is unable to utilize case-insensitive indexes.&lt;/p&gt;

&lt;p&gt;We should have this explained somewhere &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/query/regex/#index-use&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;in the documentation about &lt;tt&gt;$regex&lt;/tt&gt; index use&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="356831">DOCS-9933</key>
            <summary>Explain that regex is unable to take advantage of indexes that use collation</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="stephen.steneker@mongodb.com">Stennie Steneker</assignee>
                                    <reporter username="dmitry.ryabtsev@mongodb.com">Dmitry Ryabtsev</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Feb 2017 00:24:02 +0000</created>
                <updated>Mon, 30 Oct 2023 21:16:24 +0000</updated>
                            <resolved>Tue, 17 Oct 2017 18:46:27 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>2</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1701205" author="xgen-internal-githook" created="Tue, 17 Oct 2017 14:35:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;stennie@cpan.org&apos;, &apos;name&apos;: &apos;Stephen Steneker&apos;, &apos;username&apos;: &apos;stennie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-9933&quot; title=&quot;Explain that regex is unable to take advantage of indexes that use collation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-9933&quot;&gt;&lt;del&gt;DOCS-9933&lt;/del&gt;&lt;/a&gt;: Explain that regex is unable to take advantage of indexes that use collation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/82613775a1f6226ff4692c92282903d6726702ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/82613775a1f6226ff4692c92282903d6726702ce&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1701204" author="xgen-internal-githook" created="Tue, 17 Oct 2017 14:35:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;stennie@cpan.org&apos;, &apos;name&apos;: &apos;Stephen Steneker&apos;, &apos;username&apos;: &apos;stennie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-9933&quot; title=&quot;Explain that regex is unable to take advantage of indexes that use collation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-9933&quot;&gt;&lt;del&gt;DOCS-9933&lt;/del&gt;&lt;/a&gt;: Explain that regex is unable to take advantage of indexes that use collation&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b162f2c25e3321888e6c9e8d5e6cf659886568cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b162f2c25e3321888e6c9e8d5e6cf659886568cf&lt;/a&gt;&lt;/p&gt;</comment>
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