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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>[SERVER-51266] Add support for BSONType::RegEx in SBE</title>
                <link>https://jira.mongodb.org/browse/SERVER-51266</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once it&apos;s done, the implementation of regexp agg expressions in SBE delivered via &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50734&quot; title=&quot;Support regexp expressions in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50734&quot;&gt;&lt;del&gt;SERVER-50734&lt;/del&gt;&lt;/a&gt; should also be updated to support the new type. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1497538">SERVER-51266</key>
            <summary>Add support for BSONType::RegEx in SBE</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="13201">Fixed</resolution>
                                        <assignee username="nikita.lapkov@mongodb.com">Nikita Lapkov</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Thu, 1 Oct 2020 11:54:17 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:33 +0000</updated>
                            <resolved>Thu, 11 Feb 2021 10:58:18 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3611205" author="xgen-internal-githook" created="Thu, 11 Feb 2021 10:52:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nikita Lapkov&apos;, &apos;email&apos;: &apos;nikita.lapkov@mongodb.com&apos;, &apos;username&apos;: &apos;laplab&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51266&quot; title=&quot;Add support for BSONType::RegEx in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51266&quot;&gt;&lt;del&gt;SERVER-51266&lt;/del&gt;&lt;/a&gt; Add BSONType::RegEx support in SBE. Fix $regex aggregation expressions error handling&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d419110f2dbd9b07ee96a601356ddbe99628dc5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d419110f2dbd9b07ee96a601356ddbe99628dc5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3587679" author="JIRAUSER1255444" created="Thu, 28 Jan 2021 17:20:20 +0000"  >&lt;p&gt;I have studied the behaviour Regex expression in the classic engine. They check the following conditions and raise errors if they are not true:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Regex pattern is a string, BSONRegEx or null&lt;/li&gt;
	&lt;li&gt;Regex flags is string or null&lt;/li&gt;
	&lt;li&gt;If regex has BSONRegEx type and options field in the query is defined, only one of them can be non-empty&lt;/li&gt;
	&lt;li&gt;Regex pattern cannot contain null bytes&lt;/li&gt;
	&lt;li&gt;Regex flags cannot contain null bytes (&lt;b&gt;even&lt;/b&gt; if regex pattern is null)&lt;/li&gt;
	&lt;li&gt;Regex pattern must be valid&lt;/li&gt;
	&lt;li&gt;Regex flags must be valid&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Condition 1 is checked in the SBE tree. If condition 7 is false, there is an assert in VM. Condition 3 is not checked since we do not have BSONRegEx support in SBE yet.&lt;/p&gt;

&lt;p&gt;We do not raise an error if conditions 2, 4, 5 or 6 are false. This can be seen only when regex pattern or flags are not constant expressions. When they are constant expressions, these conditions are checked in &lt;tt&gt;optimize&lt;/tt&gt; method of respective expressions.&lt;/p&gt;

&lt;p&gt;Also, during the SBE regex expressions building we use &lt;tt&gt;getConstantPatternAndOptions&lt;/tt&gt; method to check some of these conditions. This method is not used in the classic engine and I am not sure it is consistent with classic engine&apos;s behaviour.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10520">
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                                            <outwardlinks description="causes">
                                        <issuelink>
            <issuekey id="1647780">SERVER-55180</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
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            <issuekey id="1613253">SERVER-54319</issuekey>
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