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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) INRIA -
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
*
-->
<refentry version="5.0-subset Scilab" xml:id="strindex" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns4="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:db="http://docbook.org/ns/docbook">
<info>
<pubdate>$LastChangedDate: 2008-01-06 16:57:13 +0200 (Mon, 06 Febrary
2008)$</pubdate>
</info>
<refnamediv>
<refname>strindex</refname>
<refpurpose>search position of a character string in an other
string.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>ind=strindex(haystack,needle,[flag])
[ind,which]=strindex(haystack,needle,[flag])</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>haystack</term>
<listitem>
<para>A character string. The string where to search occurrences of
<literal>needle </literal></para>
</listitem>
</varlistentry>
<varlistentry>
<term>needle</term>
<listitem>
<para>A character string or character string vector . The string(s)
to search in <literal>haystack</literal></para>
</listitem>
</varlistentry>
<varlistentry>
<term>ind</term>
<listitem>
<para>vector of indexes</para>
</listitem>
</varlistentry>
<varlistentry>
<term>which</term>
<listitem>
<para>vector of indexes</para>
</listitem>
</varlistentry>
<varlistentry>
<term>flag</term>
<listitem>
<para>string("r" for regular expression)</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para><literal>strindex</literal> searches indexes where <literal>needle
(i)</literal> is found in <literal>haystack</literal></para>
<para>for each <literal>k</literal> it exist a <literal>i</literal> shuch
that <literal>part(haystack,ind(k)+(0:length(needle(i))-1))</literal> is
the same string than <literal>needle(i)</literal>. If
<literal>which</literal> argument is required it contains these
<literal>i</literal>. When using the third parameters "r", the needle
should be a string of regular expression. And then strindex is going to
match it with haystack according to the regular express rules.</para>
<para><literal>strindex</literal> without regular expression argument is
based on Knuth-Morris-Pratt algoritm.</para>
<para>This algorithm is more powerful than that used in scilab 4.x. In
some special case, result can be different.</para>
<para>example:</para>
<para>// scilab 5.x</para>
<para>-->[k,w]=strindex('aab',['a','ab'])</para>
<para>w = 1. 1. 2. k = 1. 2. 2.</para>
<para>// scilab 4.x</para>
<para>-->[k,w]=strindex('aab',['a','ab'])</para>
<para>w = 1. 1. k = 1. 2.</para>
<para>The rules of regular expression are similar to perl language. For a
quick start , see <ulink
url="http://perldoc.perl.org/perlrequick.html">http://perldoc.perl.org/perlrequick.html</ulink>.
For a more in-depth tutorial on , see <ulink
url="http://perldoc.perl.org/perlretut.html">http://perldoc.perl.org/perlretut.html</ulink>
and for the reference page, see <ulink
url="http://perldoc.perl.org/perlre.html">http://perldoc.perl.org/perlre.html</ulink></para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
k=strindex('SCI/demos/scicos','/')
k=strindex('SCI/demos/scicos','SCI/')
k=strindex('SCI/demos/scicos','!')
k=strindex('aaaaa','aa')
k=strindex('SCI/demos/scicos',['SCI','sci'])
[k,w]=strindex('1+3*abc/2.33',['+','-','*','/'])
k=strindex('2' ,'/2(]*)?$\1/' ,'r')
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member><link linkend="string">string</link></member>
<member><link linkend="strings">strings</link></member>
<member><link linkend="regexp">regexp</link></member>
<member><link linkend="strsubst">strsubst</link></member>
</simplelist>
</refsection>
</refentry>
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