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libraries/joomla/form/rule/boolean.php

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+<?php
+/**
+ * @package     Joomla.Platform
+ * @subpackage  Form
+ *
+ * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE
+ */
+
+defined('JPATH_PLATFORM') or die;
+
+/**
+ * Form Rule class for the Joomla Platform.
+ *
+ * @package     Joomla.Platform
+ * @subpackage  Form
+ * @since       11.1
+ */
+class JFormRuleBoolean extends JFormRule
+{
+	/**
+	 * The regular expression to use in testing a form field value.
+	 *
+	 * @var    string
+	 * @since  11.1
+	 */
+	protected $regex = '^(?:[01]|true|false)$';
+
+	/**
+	 * The regular expression modifiers to use when testing a form field value.
+	 *
+	 * @var    string
+	 * @since  11.1
+	 */
+	protected $modifiers = 'i';
+}