Fix incorrect regex in ipv6_expand

qa-include/app/limits.php

@@ -204,7 +204,7 @@
 					$ip=ipv6_expand($ip);
 					$blockipclause=ipv6_expand($blockipclause);
 				}
-				return preg_match('/^'.str_replace('\\*', '[0-9a-fA-F]+', preg_quote($blockipclause, '/')).'$/', $ip) > 0;
+				return preg_match('/^'.str_replace('\\*', '([0-9A-Fa-f]+)', preg_quote($blockipclause, '/')).'$/', $ip) > 0;
 					// preg_quote misses hyphens but that is OK here
 			}
 		}

qa-include/qa-base.php

@@ -246,7 +246,7 @@
 			}
 
 			$hex = unpack("H*hex", @inet_pton($ip));
-			$ip = substr(preg_replace("/([A-f0-9]{4})/", "$1:", $hex['hex']), 0, -1);
+			$ip = substr(preg_replace("/([0-9A-Fa-f]{4})/", "$1:", $hex['hex']), 0, -1);
 
 			if($ipv6_wildcard){
 				$wildcards = explode(":", $ip);