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<?xml version="1.0" encoding="ISO-8859-1"?>
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- project.
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- 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.
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- WITHOUT ANY WARRANTY; without even the implied warranty of
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- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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-->
<refentry id="xpf_substring_before">
<refmeta>
<refentrytitle>substring-before</refentrytitle>
<refmiscinfo>XPATH</refmiscinfo>
</refmeta>
<refnamediv>
<refname>substring-before</refname>
<refpurpose>Returns the substring of the first argument string that precedes the first occurrence of the second argument string in the first argument string.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="xpf_syn_substring_before">
<funcprototype id="xpf_proto_substring_before">
<funcdef>string <function>substring-before</function></funcdef>
<paramdef><parameter>source_strg</parameter> string</paramdef>
<paramdef><parameter>sub_strg</parameter> string</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="xpf_desc_substring_before"><title>Description</title>
<para>
If the <parameter>source_strg</parameter> does not contain <parameter>sub_strg</parameter>,
the function returns the empty string.
Otherwise, it finds the first occurrence of <parameter>sub_strg</parameter> and returns
the pert of <parameter>source_strg</parameter> that precedes the occurrence.
If any argument is not a string, it is converted to string using rules for string() XPATH function.
</para>
</refsect1>
<refsect1 id="xpf_params_substring_before"><title>Parameters</title>
<refsect2><title>source_strg</title>
<para>String where the search is performed</para></refsect2>
<refsect2><title>sub_strg</title>
<para>String to search</para></refsect2>
</refsect1>
<refsect1 id="xpf_ret_substring_before"><title>Return Types</title><para>String</para></refsect1>
<refsect1 id="xpf_examples_substring_before"><title>Examples</title>
<example id="xpf_ex_substring_before"><title></title>
<para>Extract year ("1999" substring) from ISO date string</para>
<screen>substring-before('1999-12-31','-')</screen>
</example>
</refsect1>
<refsect1 id="xpf_seealso_substring_before"><title>See Also</title>
<para><link linkend="xpf_string">string()</link><link linkend="xpf_substring">substring()</link><link linkend="xpf_substring_after">substring-after()</link></para>
</refsect1>
</refentry>
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