diff --git a/packages/codemirror-lang-kcl/src/kcl.grammar b/packages/codemirror-lang-kcl/src/kcl.grammar
index 179d535be..d8d9419b1 100644
--- a/packages/codemirror-lang-kcl/src/kcl.grammar
+++ b/packages/codemirror-lang-kcl/src/kcl.grammar
@@ -85,7 +85,7 @@ commaSep1NoTrailingComma<term> { term ("," term)* }
 @tokens {
   String[isolate] { "'" ("\\" _ | !['\\])* "'" | '"' ("\\" _ | !["\\])* '"' }
 
-  Number { "." @digit+ | @digit+ ("." @digit*)? }
+  Number { "." @digit+ | @digit+ ("." @digit+)? }
   @precedence { Number, "." }
 
   AddOp { "+" | "-" }
diff --git a/packages/codemirror-lang-kcl/test/range.txt b/packages/codemirror-lang-kcl/test/range.txt
new file mode 100644
index 000000000..b52ae2953
--- /dev/null
+++ b/packages/codemirror-lang-kcl/test/range.txt
@@ -0,0 +1,43 @@
+# spaced
+
+a = [0 .. 1]
+
+==>
+Program(VariableDeclaration(VariableDefinition,
+                            Equals,
+                            ArrayExpression(IntegerRange(Number,
+                                                         Number))))
+
+# compact
+
+a = [0..1]
+
+==>
+Program(VariableDeclaration(VariableDefinition,
+                            Equals,
+                            ArrayExpression(IntegerRange(Number,
+                                                         Number))))
+
+# expr spaced
+
+a = [start .. start + 10]
+
+==>
+Program(VariableDeclaration(VariableDefinition,
+                            Equals,
+                            ArrayExpression(IntegerRange(VariableName,
+                                                         BinaryExpression(VariableName,
+                                                                          AddOp,
+                                                                          Number)))))
+
+# expr compact
+
+a = [start..start + 10]
+
+==>
+Program(VariableDeclaration(VariableDefinition,
+                            Equals,
+                            ArrayExpression(IntegerRange(VariableName,
+                                                         BinaryExpression(VariableName,
+                                                                          AddOp,
+                                                                          Number)))))