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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="xpf_contains">
<refmeta>
<refentrytitle>contains</refentrytitle>
<refmiscinfo>XPATH</refmiscinfo>
</refmeta>
<refnamediv>
<refname>contains</refname>
<refpurpose>Returns true if the first argument string contains the second argument string, and otherwise returns false.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="xpf_syn_contains">
<funcprototype id="xpf_proto_contains">
<funcdef>boolean <function>contains</function></funcdef>
<paramdef><parameter>haystack</parameter> string</paramdef>
<paramdef><parameter>needle</parameter> string</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="xpf_desc_contains"><title>Description</title>
<para>
For two given strings, this function checks if the first string contains the second string.
If any argument is not a string, it is converted to string using rules from string() XPATH function.
Thus if the second argument has no string value, the function returns true, because it will
be converted to an empty string first.</para>
</refsect1>
<refsect1 id="xpf_params_contains"><title>Parameters</title>
<refsect2><title>haystack</title>
<para>String where the search is performed</para></refsect2>
<refsect2><title>needle</title>
<para>String to search</para></refsect2>
</refsect1>
<refsect1 id="xpf_ret_contains"><title>Return Types</title><para>Boolean</para></refsect1>
<refsect1 id="xpf_examples_contains"><title>Examples</title>
<example id="xpf_ex_contains"><title></title>
<screen>contains ('OpenLink Virtuoso', 'Link')</screen>
</example>
</refsect1>
<refsect1 id="xpf_seealso_contains"><title>See Also</title>
<para><link linkend="xpf_string">string()</link><link linkend="xpf_starts_with">starts-with()</link><link linkend="xpf_ends_with">ends-with()</link></para>
</refsect1>
</refentry>
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