1 files changed, 11 insertions, 1 deletions
diff --git a/src/Data/Char/Extended.hs b/src/Data/Char/Extended.hs
index add079d..34d0c3e 100644
--- a/src/Data/Char/Extended.hs
+++ b/src/Data/Char/Extended.hs
@@ -1,9 +1,19 @@
 module Data.Char.Extended
     ( module Data.Char
     , isAsciiLetter
+    , isNick
     ) where
 
 import Data.Char
 
 isAsciiLetter :: Char -> Bool
-isAsciiLetter c = Data.Char.isAsciiUpper c || Data.Char.isAsciiLower c
+isAsciiLetter c = isAsciiUpper c || isAsciiLower c
+
+-- RFC1459
+isNick :: Char -> Bool
+isNick c =
+    0x41 <= i && i <= 0x7D || -- letters / specials
+    0x30 <= i && i <= 0x39 || -- digits
+    0x2D == i                 -- minus
+  where
+    i = ord c