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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[CSHARP-3501] LINQ3: Refactor string StartsWith/Contains/EndsWith to use regular expressions in filters</title>
                <link>https://jira.mongodb.org/browse/CSHARP-3501</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;Earlier (see &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-3445&quot; title=&quot;LINQ3: Refactor support for StartsWith/Contains/EndsWith to use $expr instead of regular expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-3445&quot;&gt;&lt;del&gt;CSHARP-3445&lt;/del&gt;&lt;/a&gt;) we decided to use $expr to translate filter expressions that use the string StartsWith/Contains/EndsWith methods.&lt;/p&gt;

&lt;p&gt;That decision made sense in one way because we already had support for those methods in the aggregation language.&lt;/p&gt;

&lt;p&gt;But we have since realized that it would be better to use regular expressions after all because they can use indexes. In some cases the server can scan only a range of the index, but even when it can&apos;t use a range, it can still scan the index instead of the collection to evaluate the filter.&lt;/p&gt;

&lt;p&gt;Additionally, the StartsWith/Contains/EndsWith methods may be preceded by some combination of ToLower/ToUpper/Trim/TrimStart/TrimEnd and those modifiers will affect the final regular expression.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1658334">CSHARP-3501</key>
            <summary>LINQ3: Refactor string StartsWith/Contains/EndsWith to use regular expressions in filters</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="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="robert@mongodb.com">Robert Stam</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Mar 2021 00:01:15 +0000</created>
                <updated>Sat, 28 Oct 2023 11:47:52 +0000</updated>
                            <resolved>Mon, 4 Oct 2021 15:34:49 +0000</resolved>
                                                    <fixVersion>2.14.0</fixVersion>
                                    <component>LINQ3</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3682912" author="rstam" created="Thu, 25 Mar 2021 00:13:33 +0000"  >&lt;p&gt;Done but not reviewed&lt;/p&gt;</comment>
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