CPerfQueryFrom::parse

function parse($sql)
{
	$sql = CPerfQuery::removeSpaces($sql);

	$match = array();
	if (preg_match("/^select(.*) from (.*?) (where|group|having|order)/is", $sql, $match))
		$this->sql = $match[2];
	elseif (preg_match("/^select(.*) from (.*?)$/is", $sql, $match))
		$this->sql = $match[2];
	else
		$this->sql = "";

	if ($this->sql)
	{
		$arJoinTables = preg_split("/(,|inner\s+join|left\s+join)(?=\s+[`"\[\]]{0,1}[a-z0-9_]+[`"\[\]]{0,1})/is", $this->sql);
		foreach ($arJoinTables as $str)
		{
			$table = new CPerfQueryTable;
			if ($table->parse($str))
			{
				$this->tables[] = $table;
			}
		}

		if (count($this->tables) <= 0)
			return false;

		$tables_regex = "(?:".implode("|", $this->getTableAliases()).")";
		/** @var CPerfQueryTable $table */
		foreach ($this->tables as $table)
		{
			$where = new CPerfQueryWhere($tables_regex);
			if ($where->parse($table->join))
			{
				$this->joins = array_merge($this->joins, $where->joins);
			}
		}
	}

	return !empty($this->tables);
}