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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-40083] Don&apos;t recompile each time $regex is evaluated when regex argument is a constant</title>
                <link>https://jira.mongodb.org/browse/SERVER-40083</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is follow-on work for&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39695&quot; title=&quot;Implement $regexFind&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39695&quot;&gt;&lt;del&gt;SERVER-39695&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Compiling a regex can be O(2^n) time (n being size of the regex). In most cases, users will probably run the same regex over and over. Recompiling the same regex over and over would be extremely silly, and in some cases may make the $regex operator completely useless.&lt;/p&gt;</description>
                <environment></environment>
        <key id="715147">SERVER-40083</key>
            <summary>Don&apos;t recompile each time $regex is evaluated when regex argument is a constant</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="arun.banala@mongodb.com">Arun Banala</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Mar 2019 23:53:18 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:02 +0000</updated>
                            <resolved>Fri, 26 Apr 2019 16:38:41 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2225990" author="xgen-internal-githook" created="Fri, 26 Apr 2019 14:21:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;arun.banala@mongodb.com&apos;, &apos;name&apos;: &apos;Arun Banala&apos;, &apos;username&apos;: &apos;banarun&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40083&quot; title=&quot;Don&amp;#39;t recompile each time $regex is evaluated when regex argument is a constant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40083&quot;&gt;&lt;del&gt;SERVER-40083&lt;/del&gt;&lt;/a&gt; Don&apos;t recompile each time $regex is evaluated when regex argument is a constant&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e700f6668fcbd5b96d46884364f1a7377945abb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e700f6668fcbd5b96d46884364f1a7377945abb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2222082" author="xgen-internal-githook" created="Tue, 23 Apr 2019 16:57:12 +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: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40083&quot; title=&quot;Don&amp;#39;t recompile each time $regex is evaluated when regex argument is a constant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40083&quot;&gt;&lt;del&gt;SERVER-40083&lt;/del&gt;&lt;/a&gt; Don&apos;t recompile each time $regex is evaluated when regex argument is a constant&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit a60f6a53734fa3a022e9ba39bbdab95608ba9108.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/03a6b3f910e051624dd6b3065b5ee9ea3b6c6fb5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/03a6b3f910e051624dd6b3065b5ee9ea3b6c6fb5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2222081" author="xgen-internal-githook" created="Tue, 23 Apr 2019 16:57:10 +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: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40083&quot; title=&quot;Don&amp;#39;t recompile each time $regex is evaluated when regex argument is a constant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40083&quot;&gt;&lt;del&gt;SERVER-40083&lt;/del&gt;&lt;/a&gt; Rename &apos;pcre&apos; variable to fix compile issue becase of typedef conflict&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 0e367bc76f23d6d876caa00a47700b3634402817.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c3a2176d5124ef3dc160db2b9f85c698e1ca2664&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c3a2176d5124ef3dc160db2b9f85c698e1ca2664&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2221631" author="xgen-internal-githook" created="Tue, 23 Apr 2019 11:34:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Arun Banala&apos;, &apos;username&apos;: &apos;banarun&apos;, &apos;email&apos;: &apos;arun.banala@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40083&quot; title=&quot;Don&amp;#39;t recompile each time $regex is evaluated when regex argument is a constant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40083&quot;&gt;&lt;del&gt;SERVER-40083&lt;/del&gt;&lt;/a&gt; Rename &apos;pcre&apos; variable to fix compile issue becase of typedef conflict&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0e367bc76f23d6d876caa00a47700b3634402817&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0e367bc76f23d6d876caa00a47700b3634402817&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2221549" author="xgen-internal-githook" created="Tue, 23 Apr 2019 10:33:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;arun.banala@mongodb.com&apos;, &apos;name&apos;: &apos;Arun Banala&apos;, &apos;username&apos;: &apos;banarun&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40083&quot; title=&quot;Don&amp;#39;t recompile each time $regex is evaluated when regex argument is a constant&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40083&quot;&gt;&lt;del&gt;SERVER-40083&lt;/del&gt;&lt;/a&gt; Don&apos;t recompile each time $regex is evaluated when regex argument is a constant&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a60f6a53734fa3a022e9ba39bbdab95608ba9108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a60f6a53734fa3a022e9ba39bbdab95608ba9108&lt;/a&gt;&lt;/p&gt;</comment>
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