Reduced backick removal collision risks

git-svn-id: https://plugins.svn.wordpress.org/postgresql-for-wordpress/trunk@226906 b8457f37-d9ea-0310-8a92-e5e31aec5664

pg4wp/driver_pgsql.php

@@ -179,7 +179,7 @@
 			$sql = preg_replace( $pattern, ' "$1" =', $sql);
 			
 			// For correct bactick removal
-			$pattern = '/[ ]*`([^`]+)`[ ]*=/';
+			$pattern = '/[ ]*`([^` ]+)`[ ]*=/';
 			$sql = preg_replace( $pattern, ' $1 =', $sql);
 
 			// WP 2.6.1 => 2.8 upgrade, removes a PostgreSQL error but there are some remaining