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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-958] Clarification on $regex use of indexes</title>
                <link>https://jira.mongodb.org/browse/DOCS-958</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;From the $regex documentation at : &lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/regex/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/operator/regex/&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;$regex uses indexes only when the regular expression has an anchor for the beginning (i.e. ^) of a string. Additionally, while /^a/, /^a.&lt;b&gt;/, and /^a.&lt;/b&gt;$/ are equivalent, they have different performance characteristics. All of these expressions use an index if an appropriate index exists; however, /^a.&lt;b&gt;/, and /^a.&lt;/b&gt;$/ are slower. /^a/ can stop scanning after matching the prefix.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The first sentence implies that $regex won&apos;t use an index unless it starts with ^, and doesn&apos;t mention case sensitivity.&lt;/p&gt;

&lt;p&gt;I believe this would be more correctly phrased as:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;$regex can only use an index efficiently when the regular expression has an anchor for the beginning (i.e. ^) of a string and is a case-sensitive match. Additionally, while /^a/, /^a.&lt;b&gt;/, and /^a.&lt;/b&gt;$/ match equivalent strings, they have different performance characteristics. All of these expressions use an index if an appropriate index exists; however, /^a.&lt;b&gt;/, and /^a.&lt;/b&gt;$/ are slower. /^a/ can stop scanning after matching the prefix.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="61240">DOCS-958</key>
            <summary>Clarification on $regex use of indexes</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="stephen.steneker@mongodb.com">Stennie Steneker</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Jan 2013 23:21:01 +0000</created>
                <updated>Mon, 30 Oct 2023 21:57:36 +0000</updated>
                            <resolved>Tue, 8 Jan 2013 17:51:30 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="233785" author="auto" created="Tue, 8 Jan 2013 03:52:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-08T03:52:31Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: merge: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-958&quot; title=&quot;Clarification on $regex use of indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-958&quot;&gt;&lt;del&gt;DOCS-958&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/1fcb424390475c2ffc73a1becfb2c91a0963bd0a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/1fcb424390475c2ffc73a1becfb2c91a0963bd0a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="233784" author="auto" created="Tue, 8 Jan 2013 03:52:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-07T23:21:15Z&apos;, u&apos;email&apos;: u&apos;stennie@10gen.com&apos;, u&apos;name&apos;: u&apos;Stephen Steneker&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-958&quot; title=&quot;Clarification on $regex use of indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-958&quot;&gt;&lt;del&gt;DOCS-958&lt;/del&gt;&lt;/a&gt;: Clarification on $regex use of indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ba87721e959af800af8f48e8633339e7d359e93f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ba87721e959af800af8f48e8633339e7d359e93f&lt;/a&gt;&lt;/p&gt;</comment>
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