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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-6853] Clarify how case sensitivity affects a prefix regex</title>
                <link>https://jira.mongodb.org/browse/DOCS-6853</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The page describes a prefix expression and separately explains a case-insensitive match but does not explain how the latter affects the former.&lt;/p&gt;

&lt;p&gt;I think the prefix expression explanation should also state that using a case insensitive match will prevent a prefix expression from being optimized. A full index scan results in this case not one bounded by the prefix.&lt;/p&gt;

&lt;p&gt;Separately it seems MongoDB could optimize the case-insensitive search for a prefix expression by simply restricting the search to two ranges: one starting with a lower-cased initial character and the other starting with an upper-cased initial character from the prefix. That would, on average be 26x faster than what happens today.&lt;/p&gt;
</description>
                <environment>Windows Server&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;https://docs.mongodb.org/v3.0/reference/operator/query/regex/&quot;&gt;https://docs.mongodb.org/v3.0/reference/operator/query/regex/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.80 Safari/537.36&lt;br/&gt;
*Referrer*: &lt;a href=&quot;https://www.google.com/&quot;&gt;https://www.google.com/&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1440 x 900&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: reference/operator/query/regex&lt;br/&gt;
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        <key id="244614">DOCS-6853</key>
            <summary>Clarify how case sensitivity affects a prefix regex</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="ianmercer">Ian Mercer</reporter>
                        <labels>
                            <label>bite-sized</label>
                            <label>collector-298ba4e7</label>
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                <created>Sat, 19 Dec 2015 17:52:06 +0000</created>
                <updated>Mon, 30 Oct 2023 22:27:41 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 11:00:45 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4943548" author="edu.bot" created="Tue, 1 Nov 2022 11:00:42 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
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