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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21915] Index not used for regular expression query containing literal &apos;|&apos; (vertical bar) character </title>
                <link>https://jira.mongodb.org/browse/SERVER-21915</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is a special case of the more general &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16622&quot; title=&quot;RegEx query predicates using the | (vertical bar) character cannot use tight index bounds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16622&quot;&gt;SERVER-16622&lt;/a&gt;. That ticket requests general support for using an index with a regular expression query with the OR operator. In this case, an index is also not used when the regular expression query contains a literal &apos;&lt;tt&gt;|&lt;/tt&gt;&apos; which is escaped through use of the &lt;tt&gt;\Q ... \E&lt;/tt&gt; escape mechanism:&lt;/p&gt;
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&lt;p&gt;Prior to the fix for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15235&quot; title=&quot;Regex query returns incorrect results when index is present&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15235&quot;&gt;&lt;del&gt;SERVER-15235&lt;/del&gt;&lt;/a&gt;, (i.e., 2.6) this query would use an index; after this fix (3.0 and later), it does not. &lt;/p&gt;

&lt;p&gt;Since this query does not use an OR operator, it would be good if it was not subject to the limitations imposed by the fix for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15235&quot; title=&quot;Regex query returns incorrect results when index is present&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15235&quot;&gt;&lt;del&gt;SERVER-15235&lt;/del&gt;&lt;/a&gt;. &lt;/p&gt;</description>
                <environment></environment>
        <key id="244092">SERVER-21915</key>
            <summary>Index not used for regular expression query containing literal &apos;|&apos; (vertical bar) character </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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="jared.wadsworth">Jared Wadsworth</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Tue, 15 Dec 2015 23:51:03 +0000</created>
                <updated>Tue, 6 Dec 2022 04:37:29 +0000</updated>
                                            <version>3.0.0</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
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