diff --git a/src/plays/calculator-by-tea/useCalcalulatorByTeaHook.ts b/src/plays/calculator-by-tea/useCalcalulatorByTeaHook.ts
index 0f3aef3314..0cdb016a87 100644
--- a/src/plays/calculator-by-tea/useCalcalulatorByTeaHook.ts
+++ b/src/plays/calculator-by-tea/useCalcalulatorByTeaHook.ts
@@ -59,7 +59,7 @@ const useCalcalulatorByTeaHook = () => {
   }
 
   function onInputRecived(expression: string) {
-    if (expression.match(/^(?:[0-9]+[-+*/]?)*[0-9]*$/)) {
+    if (expression.match(/^(?:[0-9]+[-+*/])*[0-9]*$/)) {
       setCalculationExpression(expression);
     }
   }