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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-22939] A regular expression with an escaped pipe &apos;|&apos; character is treated as non-simple</title>
                <link>https://jira.mongodb.org/browse/SERVER-22939</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This seems to be a regression from the fix of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15235?focusedCommentId=1190107&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1190107&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-15235&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The problem with this fix is that, even when I have a regular expression that has a left-anchor and an escaped &apos;|&apos; character, that query is recognized as being &quot;non-simple&quot;. &lt;/p&gt;

&lt;p&gt;This is wrong, and it causes unnecessarily that backwards compatibility is broken and performance is significantly degraded. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22872?focusedCommentId=1188778&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1188778&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-22872&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22890?focusedCommentId=1188752&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1188752&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER-22890&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="269603">SERVER-22939</key>
            <summary>A regular expression with an escaped pipe &apos;|&apos; character is treated as non-simple</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="3">Duplicate</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="itwebtf@saxobank.com">ITWEBTF SAXOBANK</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Mar 2016 08:05:08 +0000</created>
                <updated>Sun, 20 Mar 2016 12:42:00 +0000</updated>
                            <resolved>Sun, 20 Mar 2016 12:42:00 +0000</resolved>
                                    <version>3.2.3</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1208986" author="ramon.fernandez" created="Sun, 20 Mar 2016 12:41:50 +0000"  >&lt;p&gt;If I understand correctly a fix for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16622&quot; title=&quot;RegEx query predicates using the | (vertical bar) character cannot use tight index bounds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16622&quot;&gt;SERVER-16622&lt;/a&gt; will resolve this issue, so I&apos;m marking this ticket as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16622&quot; title=&quot;RegEx query predicates using the | (vertical bar) character cannot use tight index bounds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16622&quot;&gt;SERVER-16622&lt;/a&gt;. Please let me know if I overlooked something here.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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