Zabbix

<?php

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

​

/**

 * Class for regular expressions and Zabbix global expressions.

 * Any string that begins with '@' is treated as Zabbix expression.

 * Data from Zabbix expressions is taken from DB, and cached in static variable.

 *

 * @throws Exception

 */

class CGlobalRegexp {

​

    const ERROR_REGEXP_NOT_EXISTS = 1;

​

    /**

     * Determine if it's Zabbix expression.

     *

     * @var bool

     */

    protected $isZabbixRegexp;

​

    /**

     * If we create simple regular expression this contains itself as a string,

     * if we create Zabbix expression this contains array of expressions taken from DB.

     *

     * @var array|string

     */

    protected $expression;

​

    /**

     * Cache for Zabbix expressions.

     *

     * @var array

     */

    private static $_cachedExpressions = [];

​

    /**

     * Initialize expression, gets data from db for Zabbix expressions.

     *

     * @param string $regExp

     *

     * @throws Exception

     */

    public function __construct($regExp) {

        if ($regExp[0] == '@') {

            $this->isZabbixRegexp = true;

            $regExp = substr($regExp, 1);

​

            if (!isset(self::$_cachedExpressions[$regExp])) {

                self::$_cachedExpressions[$regExp] = [];