fix: "Undefined offset: 0" for backtick delimiters and address relate…

…d issues (#995, #967, #928)

This commit fixes the "Undefined offset: 0" error that occurred in the rawAddPrefix function when using backtick delimiters for table names in SQL queries. It also addresses issues reported in tickets #995, #967, and #928, which were likely related to the same underlying problem with table name identification.

Changes:

Updated the regular expression in rawAddPrefix to match backtick characters (\) as valid delimiters for table names.

This fix ensures that the function correctly identifies and prefixes table names regardless of the delimiter used.

MysqliDb.php

@@ -553,7 +553,7 @@ private function queryUnprepared($query)
     public function rawAddPrefix($query){
         $query = str_replace(PHP_EOL, '', $query);
         $query = preg_replace('/\s+/', ' ', $query);
-        preg_match_all("/(from|into|update|join|describe) [\\'\\´]?([a-zA-Z0-9_-]+)[\\'\\´]?/i", $query, $matches);
+	preg_match_all("/(from|into|update|join|describe) [\\'\\´\\`]?([a-zA-Z0-9_-]+)[\\'\\´\\`]?/i", $query, $matches);
         list($from_table, $from, $table) = $matches;
 
         // Check if there are matches