diff --git a/liberty/LibertyLex.ll b/liberty/LibertyLex.ll
index 4001db06..cfc24677 100644
--- a/liberty/LibertyLex.ll
+++ b/liberty/LibertyLex.ll
@@ -70,7 +70,7 @@ HNAME ({PIN_NAME}|{BUS_NAME}|{MIXED_NAME})([\/.]({PIN_NAME}|{BUS_NAME}|{MIXED_NA
 /* default_operating_conditions : slow_100_3.00 ; */
 /* revision : 1.0.17; */
 /* default_wire_load : xc2v250-5_avg; */
-TOKEN ({ALPHA}|{DIGIT}|_)({ALPHA}|{DIGIT}|[._\-])*
+TOKEN ({ALPHA}|{DIGIT}|_)({ALPHA}|{DIGIT}|[._\-])*(:({ALPHA}|{DIGIT}|_)+)?
 /* bus_naming_style : %s[%d] ; */
 BUS_STYLE "%s"{BUS_LEFT}"%d"{BUS_RIGHT}
 PUNCTUATION [,\:;|(){}+*&!'=]
diff --git a/liberty/LibertyParse.yy b/liberty/LibertyParse.yy
index 609826f7..1424fa29 100644
--- a/liberty/LibertyParse.yy
+++ b/liberty/LibertyParse.yy
@@ -86,18 +86,6 @@ group:
 	{ sta::libertyGroupBegin($1, $3, $5); }
 	statements '}' semi_opt
 	{ $$ = sta::libertyGroupEnd(); }
-        /* group(name1:name2) { stmts } */
-|	KEYWORD '(' KEYWORD ':' KEYWORD ')' line '{'
-	{ sta::LibertyAttrValueSeq *args = sta::makeLibertyGroupColonArgs($3, $5);
-          sta::libertyGroupBegin($1, args, $7); }
-	statements '}' semi_opt
-	{ $$ = sta::libertyGroupEnd(); }
-        /* group(name1:name2); */
-|	KEYWORD '(' KEYWORD ':' KEYWORD ')' line 
-	{ sta::LibertyAttrValueSeq *args = sta::makeLibertyGroupColonArgs($3, $5);
-          sta::libertyGroupBegin($1, args, $7); }
-	semi_opt
-	{ $$ = sta::libertyGroupEnd(); }
 	;
 
 line: /* empty */
diff --git a/liberty/LibertyParser.cc b/liberty/LibertyParser.cc
index f172229a..45a79802 100644
--- a/liberty/LibertyParser.cc
+++ b/liberty/LibertyParser.cc
@@ -127,21 +127,6 @@ libertyGroupEnd()
   }
 }
 
-// Helper for brain damaged group args with embedded colon.
-// group(name1:name2) { stmts }
-LibertyAttrValueSeq *
-makeLibertyGroupColonArgs(const char *name1,
-                          const char *name2)
-{
-  LibertyAttrValueSeq *attr_values = new sta::LibertyAttrValueSeq;
-  char *str_arg = stringPrint("%s:%s", name1, name2);
-  stringDelete(name1);
-  stringDelete(name2);
-  LibertyAttrValue *arg = makeLibertyStringAttrValue(str_arg);
-  attr_values->push_back(arg);
-  return attr_values;
-}
-
 ////////////////////////////////////////////////////////////////
 
 LibertyStmt::LibertyStmt(int line) :
diff --git a/liberty/LibertyParser.hh b/liberty/LibertyParser.hh
index 8b82059c..bd3a8804 100644
--- a/liberty/LibertyParser.hh
+++ b/liberty/LibertyParser.hh
@@ -303,9 +303,6 @@ void
 libertyGroupBegin(const char *type,
 		  LibertyAttrValueSeq *params,
 		  int line);
-LibertyAttrValueSeq *
-makeLibertyGroupColonArgs(const char *name1,
-                          const char *name2);
 LibertyGroup *
 libertyGroupEnd();
 LibertyGroup *