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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-6500] Regex find with different counts</title>
                <link>https://jira.mongodb.org/browse/SERVER-6500</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello I was just testing how to perform SQL Like operations in MongoDB but I am quite confused about the results.&lt;br/&gt;
The usage of &quot;/&quot; char and &quot;^&quot; and also the results are strange.Is there something I am missing ?&lt;br/&gt;
Queries and results are below :&lt;/p&gt;

&lt;p&gt;&amp;gt; db.user.find({Email:{$regex : &quot;aslan&quot;}}).count()&lt;br/&gt;
4174&lt;br/&gt;
&amp;gt; db.user.find({Email:{$regex : &quot;^aslan&quot;}}).count()&lt;br/&gt;
841&lt;br/&gt;
&amp;gt; db.user.find({Email:{$regex : &quot;/^aslan/&quot;}}).count()&lt;br/&gt;
0&lt;br/&gt;
&amp;gt; db.user.find({Email:{$regex : &quot;/aslan/&quot;}}).count()&lt;br/&gt;
0&lt;br/&gt;
&amp;gt; db.user.find({Email:{$regex : &quot;aslan*&quot;}}).count()&lt;br/&gt;
4410&lt;br/&gt;
&amp;gt; db.user.find({Email:{$regex : &quot;.&lt;b&gt;aslan.&lt;/b&gt;&quot;}}).count()&lt;br/&gt;
4174&lt;br/&gt;
&amp;gt; db.user.find({Email:{$regex : &quot;/.&lt;b&gt;aslan.&lt;/b&gt;/&quot;}}).count()&lt;br/&gt;
0&lt;/p&gt;


&lt;p&gt;And I think there should be more explanation and example about regex on the page &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Advanced+Queries&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Advanced+Queries&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Thnx&lt;/p&gt;</description>
                <environment>ubuntu server 12.04 lts with  2GB ram ( virtual pc on MacOS X with Parallels Desktop)</environment>
        <key id="44642">SERVER-6500</key>
            <summary>Regex find with different counts</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="e2burner">erhan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Jul 2012 09:12:43 +0000</created>
                <updated>Sat, 9 Jul 2016 21:09:29 +0000</updated>
                            <resolved>Wed, 18 Jul 2012 15:23:18 +0000</resolved>
                                    <version>2.1.2</version>
                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="144484" author="renctan" created="Wed, 18 Jul 2012 15:23:18 +0000"  >&lt;p&gt;Needs more explanation of the regex syntax. So we either document them or should at the very least direct them to the documentation of the pcre regex syntax (this is the library the server code currently uses to do regex matching).&lt;/p&gt;</comment>
                            <comment id="144451" author="renctan" created="Wed, 18 Jul 2012 14:17:58 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;You don&apos;t need the $regex if you want to use the // notation. Ex:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.user.find({ Email: /aslan/ }); // equivalent to db.user.find({ Email: { $regex: &quot;aslan&quot; }})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;^ is a marker used to indicate that strings will only count as a match if it the pattern is at the beginning of the string.&lt;/p&gt;

&lt;p&gt;Ex. of strings that will match /^aslan/:&lt;/p&gt;

&lt;p&gt;&quot;aslander&quot;&lt;br/&gt;
&quot;aslang&quot;&lt;/p&gt;

&lt;p&gt;Ex. of strings that will not match /^aslan/:&lt;/p&gt;

&lt;p&gt;&quot;gaslander&quot;&lt;br/&gt;
&quot;www.aslan.com&quot;&lt;/p&gt;</comment>
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