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    <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-24633] Support Turkish rules for case folding in $regex</title>
                <link>https://jira.mongodb.org/browse/SERVER-24633</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;h6&gt;&lt;a name=&quot;Originalsummary&quot;&gt;&lt;/a&gt;Original summary&lt;/h6&gt;
&lt;p&gt;Case Sensitivity Mistake &amp;#8211;  i-&#304; &lt;/p&gt;

&lt;h6&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h6&gt;
&lt;p&gt;Example data:&lt;/p&gt;
{
  &quot;_id&quot; : ObjectId(&quot;562395d2f4ac61190f8b463a&quot;),
  &quot;category_name&quot; : &quot;&#304;&#231;me Sular&#305; ve Kaynak Sular&#305;&quot;,
  &quot;category_name_en&quot; : &quot;Water - Bottled &amp;amp; Bulk&quot;
}

&lt;p&gt;db.categories.find({category_name:{ $regex: &apos;&#304;&#231;me&apos;, $options: &apos;i&apos;}})&lt;br/&gt;
One result found. it is works well&lt;/p&gt;

&lt;p&gt;However&lt;/p&gt;

&lt;p&gt;When i swap capital &#304; with small i,i received no result.&lt;/p&gt;

&lt;p&gt;db.categories.find({category_name:{ $regex: &apos;i&#231;me&apos;, $options: &apos;i&apos;}})&lt;br/&gt;
no result.&lt;/p&gt;

&lt;p&gt;The problem might be because of incompability of turkish characters . &lt;/p&gt;

&lt;p&gt;King Regards , &lt;/p&gt;





</description>
                <environment></environment>
        <key id="294660">SERVER-24633</key>
            <summary>Support Turkish rules for case folding in $regex</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="admin@yellow.com.tr">Engin Kartal</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Jun 2016 11:27:17 +0000</created>
                <updated>Tue, 6 Dec 2022 04:23:37 +0000</updated>
                                                                            <component>Text Search</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="4289607" author="JIRAUSER1269856" created="Wed, 12 Jan 2022 22:13:37 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I have same problem.&lt;br/&gt;
MongoDB Version:&#160;5.0.4&lt;/p&gt;

&lt;p&gt;Kind Regards,&lt;/p&gt;

&lt;p&gt;Orhan&lt;/p&gt;</comment>
                            <comment id="1300712" author="thomas.schubert" created="Tue, 21 Jun 2016 03:53:48 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=admin%40yellow.com.tr&quot; class=&quot;user-hover&quot; rel=&quot;admin@yellow.com.tr&quot;&gt;admin@yellow.com.tr&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this behavior. As you correctly identified, this is the result of a difference in casing between &lt;a href=&quot;https://en.wikipedia.org/wiki/Dotted_and_dotless_I&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;English and Turkish languages&lt;/a&gt;:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Most Unicode software uppercases &#305; to I and lowercases &#304; to i, but, unless specifically set up for Turkish, it lowercases I to i and uppercases i to I. Thus uppercasing then lowercasing, or vice versa, changes the letters.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Since the current behavior is expected, I am modifying this ticket to be a feature request to support Turkish rules for case folding and marking this ticket to be considered during the next round of planning. Please continue to watch for updates.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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