Fix match for string-quoted identifier

The pattern added in 785307ee only matches single-character identifiers,
but should match identifiers of any non-zero length.  Fix it.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

pg4wp/driver_pgsql.php

@@ -323,7 +323,7 @@
 			// MySQL supports strings as names, PostgreSQL needs identifiers.
 			// Limit to after closing parenthesis to reduce false-positives
 			// Currently only an issue for nextgen-gallery plugin
-			$pattern = '/\) AS \'([^\'])\'/';
+			$pattern = '/\) AS \'([^\']+)\'/';
 			$sql = preg_replace( $pattern, ') AS "$1"', $sql);
 		} // SELECT
 		elseif( 0 === strpos($sql, 'UPDATE'))