--- a/gameServer/Actions.hs	Sat Oct 01 19:06:12 2016 +0200
+++ b/gameServer/Actions.hs	Sat Oct 01 20:56:42 2016 +0300
@@ -40,6 +40,9 @@
 import Network.Socket
 import System.Random
 import qualified Data.Traversable as DT
+import Text.Regex.Base
+import qualified Text.Regex.TDFA as TDFA
+import qualified Text.Regex.TDFA.ByteString as TDFAB
 -----------------------------
 #if defined(OFFICIAL_SERVER)
 import OfficialServer.GameReplayStore
@@ -658,9 +661,13 @@
     where
         checkNotExpired testTime (BanByIP _ _ time) = testTime `diffUTCTime` time <= 0
         checkNotExpired testTime (BanByNick _ _ time) = testTime `diffUTCTime` time <= 0
-        checkBan True ip _ (BanByIP bip _ _) = bip `B.isPrefixOf` ip
-        checkBan False _ n (BanByNick bn _ _) = caseInsensitiveCompare bn n
+        checkBan True ip _ (BanByIP bip _ _) = isMatch bip ip
+        checkBan False _ n (BanByNick bn _ _) = isMatch bn n
         checkBan _ _ _ _ = False
+        isMatch :: B.ByteString -> B.ByteString -> Bool
+        isMatch rexp src = (==) (Just True) $ mrexp rexp >>= flip matchM src
+        mrexp :: B.ByteString -> Maybe TDFAB.Regex
+        mrexp = makeRegexOptsM TDFA.defaultCompOpt{TDFA.caseSensitive = False} TDFA.defaultExecOpt
         getBanReason (BanByIP _ msg _) = msg
         getBanReason (BanByNick _ msg _) = msg
 

--- a/gameServer/CMakeLists.txt	Sat Oct 01 19:06:12 2016 +0200
+++ b/gameServer/CMakeLists.txt	Sat Oct 01 20:56:42 2016 +0300
@@ -20,6 +20,7 @@
 check_haskell_module_exists("System.Entropy" openHandle 0 entropy)
 check_haskell_module_exists("Codec.Compression.Zlib" decompress 1 zlib)
 check_haskell_module_exists("System.Random" getStdGen 0 random)
+check_haskell_module_exists("Text.Regex.TDFA.ByteString" execute 2 regex-tdfa)
 
 # this one needs type signatures to work
 # check_haskell_module_exists("Control.DeepSeq" deepseq 2 deepseq)

--- a/gameServer/hedgewars-server.cabal	Sat Oct 01 19:06:12 2016 +0200
+++ b/gameServer/hedgewars-server.cabal	Sat Oct 01 20:56:42 2016 +0300
@@ -5,7 +5,7 @@
 Homepage:            http://www.hedgewars.org/
 License:             GPL-2
 Author:              unC0Rr
-Maintainer:          unC0Rr@hedgewars.org
+Maintainer:          a.korotaev@hedgewars.org
 Category:            Game
 Build-type:          Simple
 Cabal-version:       >=1.10
@@ -32,7 +32,8 @@
     utf8-string,
     SHA,
     entropy,
-    zlib >= 0.5.3 && < 0.6
+    zlib >= 0.5.3 && < 0.6,
+    regex-tdfa
 
   if !os(windows)
     build-depends: unix