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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-2265] Map reduce failed with special character (utf-8) and a pipe ( | )</title>
                <link>https://jira.mongodb.org/browse/SERVER-2265</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I just want to use the map reduce function of MongoDB. So I wrote a simple map_index function in javascript :&lt;/p&gt;

&lt;p&gt;function map_index()&lt;br/&gt;
{&lt;br/&gt;
    var _translit = [&lt;br/&gt;
	&lt;span class=&quot;error&quot;&gt;&amp;#91;/&#228;|&#230;/g, &amp;#39;ae&amp;#39;&amp;#93;&lt;/span&gt;,&lt;br/&gt;
    ];&lt;br/&gt;
...&lt;br/&gt;
...&lt;br/&gt;
...&lt;/p&gt;

&lt;p&gt;After that, I try to load the file (index.js) into Mongo Shell and :&lt;/p&gt;

&lt;p&gt;&amp;gt; load(&apos;index.js&apos;);&lt;br/&gt;
map reduce failed: {&lt;br/&gt;
	&quot;assertion&quot; : &quot;map compile failed: JS Error: SyntaxError: unterminated regular expression literal nofile_b:1&quot;,&lt;br/&gt;
	&quot;assertionCode&quot; : 9012,&lt;br/&gt;
	&quot;errmsg&quot; : &quot;db assertion failure&quot;,&lt;br/&gt;
	&quot;ok&quot; : 0&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;There is no problem if I remove &quot;| &#230;&quot;.&lt;/p&gt;

&lt;p&gt;    var _translit = [&lt;br/&gt;
	&lt;span class=&quot;error&quot;&gt;&amp;#91;/&#228;/g, &amp;#39;ae&amp;#39;&amp;#93;&lt;/span&gt;,&lt;br/&gt;
    ];&lt;/p&gt;

&lt;p&gt;The same behavior when I remove &quot;&#228;&quot; and keep &quot;&#230;&quot;.&lt;/p&gt;

&lt;p&gt;Of course, the file is encoded in utf-8. Full test code can be found as Attachment.&lt;/p&gt;</description>
                <environment>osx x86_64 - mongodb 1.6.5</environment>
        <key id="14033">SERVER-2265</key>
            <summary>Map reduce failed with special character (utf-8) and a pipe ( | )</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="seyz">Sandro Munda</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Dec 2010 14:48:11 +0000</created>
                <updated>Mon, 24 Jun 2013 17:42:18 +0000</updated>
                            <resolved>Mon, 24 Jun 2013 17:42:18 +0000</resolved>
                                    <version>1.6.5</version>
                                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="366601" author="tad" created="Mon, 24 Jun 2013 17:42:18 +0000"  >&lt;p&gt;SpiderMonkey has been replaced by V8.&lt;/p&gt;</comment>
                            <comment id="153608" author="tad" created="Wed, 15 Aug 2012 15:12:31 +0000"  >&lt;p&gt;It&apos;s a SpiderMonkey bug.  You don&apos;t need to involve the database or map-reduce at all.&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;   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;&amp;gt; var regex = /&#228;|&#230;/g&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; regex&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;/&#228;|&#230;/g&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; function return_regex() { return /&#228;|&#230;/g ; };&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; return_regex&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;function return_regex() {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    return /&#228;|&#230;;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;&amp;gt; &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;The function has corrupted the regex already.  Apparently, it is using the count of Unicode characters as the byte count, so two UTF-8 characters of two bytes each cause two bytes to be lost from the end of the string.&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;   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;&amp;gt; function trash_3() { return /&#228;&#228;&#228;987654321/ }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; trash_3&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;function trash_3() {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    return /&#228;&#228;&#228;9876543;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; function trash_2() { return /&#228;&#228;987654321/ }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; trash_2&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;function trash_2() {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    return /&#228;&#228;98765432;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; function trash_1() { return /&#228;987654321/ }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;&amp;gt; trash_1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;function trash_1() {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    return /&#228;987654321;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;&amp;gt; &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;Three 2-byte UTF-8 characters cause three bytes to be lost from the end; two UTF-8 characters loses two bytes; one UTF-8 character loses one bytes.&lt;/p&gt;</comment>
                            <comment id="59996" author="antoine" created="Wed, 12 Oct 2011 07:21:06 +0000"  >&lt;p&gt;It does work correctly in V8&lt;br/&gt;
&amp;gt; str = &quot;/&#228;|&#230;/g&quot;&lt;br/&gt;
/&#228;|&#230;/g&lt;br/&gt;
&amp;gt; re = /&#228;|&#230;/g&lt;br/&gt;
/&#228;|&#230;/g&lt;br/&gt;
&amp;gt; var f = function() &lt;/p&gt;
{ var re = /&#228;|&#230;/g;}&lt;br/&gt;
&amp;gt; f&lt;br/&gt;
function () { var re = /&#228;|&#230;/g;}

&lt;p&gt;should consider opening bug against SM, though it may be fixed in SM 1.8&lt;/p&gt;</comment>
                            <comment id="59977" author="antoine" created="Wed, 12 Oct 2011 05:38:41 +0000"  >&lt;p&gt;Looks like the server is seeing a partial view of the expression, it&apos;s missing the closing &quot;/g&quot;.&lt;/p&gt;

&lt;p&gt;Tue Oct 11 22:04:22 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn35&amp;#93;&lt;/span&gt; JS Error: SyntaxError: unterminated regular expression literal nofile_b:1&lt;br/&gt;
Tue Oct 11 22:04:22 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn35&amp;#93;&lt;/span&gt; compile failed for: function map_index() {&lt;br/&gt;
    var _translit = [&lt;span class=&quot;error&quot;&gt;&amp;#91;/&#228;|&#230;, &amp;quot;ae&amp;quot;&amp;#93;&lt;/span&gt;, ];&lt;br/&gt;
    emit(this._id, &lt;/p&gt;
{title:[this.title]}
&lt;p&gt;);&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;A simpler view of the problem is:&lt;/p&gt;

&lt;p&gt;&amp;gt; em = function map_index(){&lt;br/&gt;
...     var _translit = [&lt;br/&gt;
...     &lt;span class=&quot;error&quot;&gt;&amp;#91;/&#228;|&#230;/g, &amp;#39;ae&amp;#39;&amp;#93;&lt;/span&gt;,&lt;br/&gt;
...     ];&lt;br/&gt;
...     emit(this._id, &lt;/p&gt;
{ title: [this.title] }
&lt;p&gt;);&lt;br/&gt;
... }&lt;br/&gt;
function map_index() {&lt;br/&gt;
    var _translit = [&lt;span class=&quot;error&quot;&gt;&amp;#91;/&#228;|&#230;, &amp;quot;ae&amp;quot;&amp;#93;&lt;/span&gt;, ];&lt;br/&gt;
    emit(this._id, &lt;/p&gt;
{title:[this.title]}
&lt;p&gt;);&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;As you can see the 2 last characters of the regular expression have disappeared.&lt;br/&gt;
This is due to the JS engine miscalculating the length of the expression.&lt;br/&gt;
The special characters use 2 bytes each, but somehow the engine assumes all characters are 1 byte.&lt;/p&gt;

&lt;p&gt;Within a string the result is correct:&lt;br/&gt;
&amp;gt; str = &quot;/&#228;|&#230;/g&quot;&lt;br/&gt;
/&#228;|&#230;/g&lt;/p&gt;

&lt;p&gt;Even a simple regular expression object works:&lt;br/&gt;
&amp;gt; var re = [ /&#228;|&#230;/g, &quot;ae&quot;]&lt;br/&gt;
&amp;gt; re&lt;br/&gt;
[ /&#228;|&#230;/g, &quot;ae&quot; ]&lt;/p&gt;

&lt;p&gt;But if it&apos;s within a function, bug appears:&lt;br/&gt;
&amp;gt; var f = function() &lt;/p&gt;
{ var re = /&#228;|&#230;/g;}
&lt;p&gt;&amp;gt; f&lt;br/&gt;
function () {&lt;br/&gt;
    var re = /&#228;|&#230;;&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;Looks like this is a bug with spidermonkey.&lt;br/&gt;
Will try with v8.&lt;/p&gt;</comment>
                            <comment id="21701" author="seyz" created="Wed, 22 Dec 2010 08:49:42 +0000"  >&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;I wrote a simple testcase. You can find it in attachment. Before loading this file, you can execute this in the mongo shell :&lt;/p&gt;

&lt;p&gt;&amp;gt; db.test.drop()              &lt;br/&gt;
true&lt;br/&gt;
&amp;gt; db.test.save(&lt;/p&gt;
{title: &quot;foo&quot;}
&lt;p&gt;)&lt;br/&gt;
&amp;gt;&lt;/p&gt;

&lt;p&gt;Thanks !&lt;/p&gt;</comment>
                            <comment id="21645" author="eliot" created="Tue, 21 Dec 2010 16:17:07 +0000"  >&lt;p&gt;There needs to be some certain fields, an empty object doesn&apos;t trigger it.&lt;/p&gt;

&lt;p&gt;Also, we don&apos;t know what &quot;slug&quot; is.&lt;/p&gt;</comment>
                            <comment id="21643" author="seyz" created="Tue, 21 Dec 2010 16:13:25 +0000"  >&lt;p&gt;This exemple failed with all collections. Not need a specific collection.&lt;br/&gt;
Thanks.&lt;/p&gt;</comment>
                            <comment id="21641" author="eliot" created="Tue, 21 Dec 2010 16:03:56 +0000"  >&lt;p&gt;Can you also attach some sample data?&lt;br/&gt;
Ideally a mongodump file?&lt;/p&gt;</comment>
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