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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-55509] {example: /regex/} and {example: {$eq: /regex/}} do not mean the same thing</title>
                <link>https://jira.mongodb.org/browse/SERVER-55509</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Adding a $eq should not have an impact on the meaning of the query, and generally it does not. {&lt;tt&gt;a: 4&lt;/tt&gt;}&#160;is the same query as {&lt;tt&gt;a: {$eq: 4&lt;/tt&gt;}}. Regexes are the exception to this, where {&lt;tt&gt;a: /regex/&lt;/tt&gt;} will match either a stored regex type which is identical or a string which matches the regex. {&lt;tt&gt;a: {$eq: /regex/&lt;/tt&gt;}} will only match stored regexes. This makes it harder to generally reason about the language. It makes it harder to write generic query analysis, parsing, or transformations - leading to special cases &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d1a5db3e68e5c44e00d40505e41758c035f6fbbc/src/mongo/db/pipeline/document_source_lookup.cpp#L624&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;such as this one in $lookup&lt;/a&gt;.&#160;&lt;/p&gt;

&lt;p&gt;This also complicates recommendations for avoiding &quot;MQL injections&quot; by adding an explicit $eq to your application&apos;s generated queries. An &quot;MQL injection&quot; might happen if your application issues a query {&lt;tt&gt;field: &amp;lt;value selected by user&amp;gt;&lt;/tt&gt;} and a malicious user inputs a value like {&lt;tt&gt;$gt: 4&lt;/tt&gt;} instead of an expected constant. Using an explicit $eq would prevent the user from being able to change the query.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1658264">SERVER-55509</key>
            <summary>{example: /regex/} and {example: {$eq: /regex/}} do not mean the same thing</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Mar 2021 21:56:17 +0000</created>
                <updated>Tue, 6 Dec 2022 01:29:03 +0000</updated>
                                                                            <component>Query Language</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3684938" author="JIRAUSER1257640" created="Thu, 25 Mar 2021 21:45:36 +0000"  >&lt;p&gt;The documentation of the use of regex seems to be a little bit unclear, I actually did not see the behavior mentioned in this ticket documented, maybe I missed it somewhere or we should clarify in the documentation?&lt;/p&gt;</comment>
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            <issuekey id="1663274">SERVER-55639</issuekey>
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            <issuekey id="91048">SERVER-10840</issuekey>
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            <issuekey id="514146">SERVER-34012</issuekey>
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