Source for file RegexSearch.abstract.php

<?php
/**
 * @since 12/8/05
 * @package harmoni.osid_v2.repository.search
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: RegexSearch.abstract.php,v 1.1 2005/12/08 20:12:41 adamfranco Exp $
 */ 
 
require_once(dirname(__FILE__)."/SearchModule.interface.php");
 
/**
 * Abstract regular expression matching class that handles translation between
 * simple wildcard-based search strings and regular expression strings.
 * 
 * @since 12/8/05
 * @package harmoni.osid_v2.repository.search
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: RegexSearch.abstract.php,v 1.1 2005/12/08 20:12:41 adamfranco Exp $
 */
class RegexSearch
    extends SearchModuleInterface 
{
        
    /**
     * Translate a simple search string such as 'ge*ing' into a regex string such
     * as '/\<ge.*ing\>/i'
     * 
     * @param string $simpleString 
     * @return string 
     * @access public
     * @since 12/8/05
     */
    function translateToRegex ($simpleString) {
        $simpleString = str_replace(
            chr(92), 
            '\x5C', 
            $simpleString);
            
        $searches = array(
                '/[\[\](){}\.\/|$^?]/',
                '/\*/'
            );
            
        $replacements = array(
                '\\\\\0',
                '.*'
            );
        
        return '/'.preg_replace($searches, $replacements, $simpleString).'/i';
    }
    
}
 
?>