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diff --git a/lib/old-IRC/Grammar.pm6 b/lib/old-IRC/Grammar.pm6
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+unit grammar IRC::Grammar;
+token TOP { <message>+ }
+token SPACE { ' '+ }
+token message { [':' <prefix> <SPACE> ]? <command> <params> \n }
+    token prefix  {
+        [ <servername> || <nick> ['!' <user>]? ['@' <host>]? ]
+        <before <SPACE>>
+    }
+        token servername { <host> }
+        token nick { <letter> [ <letter> | <number> | <special> ]* }
+        token user { <-[\ \x0\r\n]>+?  <before [<SPACE> | '@']>}
+        token host { <-[\s!@]>+ }
+    token command { <letter>+ | <number>**3 }
+    token params { <SPACE>* [ ':' <trailing> | <middle> <params> ]? }
+        token middle { <-[:\ \x0\r\n]> <-[\ \x0\r\n]>* }
+        token trailing { <-[\x0\r\n]>* }
+
+    token letter { <[a..zA..Z]> }
+    token number { <[0..9]> }
+    token special { <[-_\[\]\\`^{}]> }