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    <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-39697] Regex MatchExpression should error at parse time if the regex is not valid</title>
                <link>https://jira.mongodb.org/browse/SERVER-39697</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We attempted this improvement in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30986&quot; title=&quot;Server should error on invalid regex match expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30986&quot;&gt;&lt;del&gt;SERVER-30986&lt;/del&gt;&lt;/a&gt;, the fix for which is present in 3.6.0 through 3.6.5 and 4.0.0. Due to a bug in the underlying PCRE library, this fix broke valid regular expressions which rely on some verbs (e.g. the UCP verb for configuring unicode support). See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34933&quot; title=&quot;pcre verb support&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34933&quot;&gt;&lt;del&gt;SERVER-34933&lt;/del&gt;&lt;/a&gt; for details. This work was subsequently reverted, so recent versions of the 3.6 and 4.0 due not correctly reject invalid regular expressions.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39693&quot; title=&quot;Fix bug in PCRE which reports error for valid regex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39693&quot;&gt;&lt;del&gt;SERVER-39693&lt;/del&gt;&lt;/a&gt; tracks the work to fix the underlying issue in PCRE. Once &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39693&quot; title=&quot;Fix bug in PCRE which reports error for valid regex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39693&quot;&gt;&lt;del&gt;SERVER-39693&lt;/del&gt;&lt;/a&gt; is done, we can reintroduce parse-time validation of regular expressions in the &lt;tt&gt;MatchExpression&lt;/tt&gt; library. We should also make sure that any new aggregation expressions which evaluate perl-compatible regexes error at parse time if the regex is invalid, but this work is tracked elsewhere.&lt;/p&gt;</description>
                <environment></environment>
        <key id="701485">SERVER-39697</key>
            <summary>Regex MatchExpression should error at parse time if the regex is not valid</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="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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Feb 2019 20:24:01 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:48 +0000</updated>
                            <resolved>Thu, 28 Feb 2019 18:52:35 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2166554" author="xgen-internal-githook" created="Thu, 28 Feb 2019 18:50:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ian Boros&apos;, &apos;username&apos;: &apos;puppyofkosh&apos;, &apos;email&apos;: &apos;puppyofkosh@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39697&quot; title=&quot;Regex MatchExpression should error at parse time if the regex is not valid&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39697&quot;&gt;&lt;del&gt;SERVER-39697&lt;/del&gt;&lt;/a&gt; MatchExpressions regex error at parse time if regex is invalid&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5f772b0b1139f4b9bbff098d4bcee59cf2e95cda&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5f772b0b1139f4b9bbff098d4bcee59cf2e95cda&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="701451">SERVER-39693</issuekey>
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                                        <issuelink>
            <issuekey id="1482605">SERVER-51083</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="701487">SERVER-39698</issuekey>
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            <issuekey id="542159">SERVER-34933</issuekey>
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