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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_V2.1-en.txt
*
-->
<refentry 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"
xml:id="regexp" xml:lang="en">
<refnamediv>
<refname>regexp</refname>
<refpurpose>
find a substring that matches the regular expression string
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[start] = regexp(input, pattern, [flag])
[start, final] = regexp(input, pattern, [flag])
[start, final, match] = regexp(input, pattern, [flag])
[start, final, match, foundString] = regexp(input, pattern, [flag])
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>input</term>
<listitem>
<para>a string.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>pattern</term>
<listitem>
<para>
a character string (under the rules of regular expression).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>start</term>
<listitem>
<para>
the starting index of each substring of
<varname>input</varname> that matches the regular
expression string <varname>pattern</varname>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>final</term>
<listitem>
<para>
the ending index of each substring of
<varname>input</varname> that matches the regular
expression string <varname>pattern</varname>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>match</term>
<listitem>
<para>
the text of each substring of <varname>input</varname>
that matches <varname>pattern</varname>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>foundString</term>
<listitem>
<para>
the captured parenthesized <literal>subpatterns</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>[flag]</term>
<listitem>
<para>
<literal>'o'</literal> for matching the pattern once.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<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>
<para>
A difference with Perl is that matching a position but no character
(for example, with <literal>/^/</literal> or
<literal>/(?=o)/</literal>) is a successful match in Perl but not
in Scilab.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
regexp('xabyabbbz','/ab*/','o')
regexp('a!','/((((((((((a))))))))))\041/')
regexp('ABCC','/^abc$/i')
regexp('ABC','/ab|cd/i')
[a b c]=regexp('XABYABBBZ','/ab*/i')
piString="3.14"
[a,b,c,piStringSplit]=regexp(piString,"/(\d+)\.(\d+)/")
disp(piStringSplit(1))
disp(piStringSplit(2))
[a,b,c,d]=regexp('xabyabbbz','/ab(.*)b(.*)/')
size(d)
// get host name from URL
myURL="http://www.scilab.org/download/";
[a,b,c,d]=regexp(myURL,'@^(?:http://)?([^/]+)@i')
str='foobar: 2012';
// Using named subpatterns
[a,b,c,d]=regexp(str,'/(?P<name>\w+): (?P<digit>\d+)/')
d(1)=="foobar"
d(2)=="2012"
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="strindex">strindex</link>
</member>
</simplelist>
</refsection>
<refsection>
<title>History</title>
<revhistory>
<revision>
<revnumber>5.4.0</revnumber>
<revremark>
A new output argument, foundString, has been added to retrieve subpatterns matches.
</revremark>
</revision>
</revhistory>
</refsection>
</refentry>
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