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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-13253] Investigate changes in SERVER-44617: $regexFind crash when one of the capture group doesn&apos;t match the input but pattern matches</title>
                <link>https://jira.mongodb.org/browse/DOCS-13253</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    With this change, we will put a &apos;null&apos; placeholder if there is a non-matching capture group. We should clarify this new semantics using an example in the docs.  &lt;/p&gt;

&lt;p&gt;This is also backported to 4.2. We will need to update the docs for 4.2 as well.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    When running a simple regex query against 4.2.1 the mongod will crash with:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-11-14T05:52:41.884-0500 F  -        [conn1] terminate() called. An exception is active; attempting to gather more information&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2019-11-14T05:52:41.982-0500 F  -        [conn1] std::exception::what(): out of range&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;



&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1029173">DOCS-13253</key>
            <summary>Investigate changes in SERVER-44617: $regexFind crash when one of the capture group doesn&apos;t match the input but pattern matches</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="jeffrey.allen@mongodb.com">Jeffrey Allen</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Nov 2019 16:31:42 +0000</created>
                <updated>Mon, 13 Nov 2023 18:13:11 +0000</updated>
                            <resolved>Mon, 27 Jan 2020 18:25:14 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                    <fixVersion>4.2.2</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2867603" author="xgen-internal-githook" created="Tue, 11 Feb 2020 22:40:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jeff-allen-mongo&apos;, &apos;name&apos;: &apos;jeff-allen-mongo&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;}
&lt;p&gt;Message:  (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13253&quot; title=&quot;Investigate changes in SERVER-44617: $regexFind crash when one of the capture group doesn&amp;#39;t match the input but pattern matches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13253&quot;&gt;&lt;del&gt;DOCS-13253&lt;/del&gt;&lt;/a&gt;): Explain captures array behavior for regexFind/regexFindAll&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/644ed04ab8476ebb5b488ab0cfef4f15e6696993&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/644ed04ab8476ebb5b488ab0cfef4f15e6696993&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2766214" author="xgen-internal-githook" created="Mon, 27 Jan 2020 18:30:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jeff-allen-mongo&apos;, &apos;name&apos;: &apos;jeff-allen-mongo&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;}
&lt;p&gt;Message:  (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13253&quot; title=&quot;Investigate changes in SERVER-44617: $regexFind crash when one of the capture group doesn&amp;#39;t match the input but pattern matches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13253&quot;&gt;&lt;del&gt;DOCS-13253&lt;/del&gt;&lt;/a&gt;): Explain captures array behavior for regexFind/regexFindAll&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/644ed04ab8476ebb5b488ab0cfef4f15e6696993&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/644ed04ab8476ebb5b488ab0cfef4f15e6696993&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2766208" author="xgen-internal-githook" created="Mon, 27 Jan 2020 18:28:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jeff-allen-mongo&apos;, &apos;name&apos;: &apos;jeff-allen-mongo&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;}
&lt;p&gt;Message:  (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13253&quot; title=&quot;Investigate changes in SERVER-44617: $regexFind crash when one of the capture group doesn&amp;#39;t match the input but pattern matches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13253&quot;&gt;&lt;del&gt;DOCS-13253&lt;/del&gt;&lt;/a&gt;): Explain captures array behavior for regexFind/regexFindAll&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/d57c5489a2cbe461cb387dcf2741e91f5fc6d930&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d57c5489a2cbe461cb387dcf2741e91f5fc6d930&lt;/a&gt;&lt;/p&gt;</comment>
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