diff --git a/src/main/java/com/kamco/cd/kamcoback/postgres/core/CommonCodeCoreService.java b/src/main/java/com/kamco/cd/kamcoback/postgres/core/CommonCodeCoreService.java
index 19e91265..259b885c 100644
--- a/src/main/java/com/kamco/cd/kamcoback/postgres/core/CommonCodeCoreService.java
+++ b/src/main/java/com/kamco/cd/kamcoback/postgres/core/CommonCodeCoreService.java
@@ -43,7 +43,7 @@ public class CommonCodeCoreService
   @CacheEvict(value = "commonCodes", allEntries = true)
   public ResponseObj save(CommonCodeDto.AddReq req) {
 
-    String regex = "^([A-Z]+|[0-9]+|[A-Z0-9]+(_[A-Z0-9]+)+)$";
+    String regex = "^[A-Z0-9]+(_[A-Z0-9]+)*$";
     boolean isValid = req.getCode().matches(regex);
     if (!isValid) {
       return new ResponseObj(ApiResponseCode.CONFLICT, "공통코드에 영문 대문자, 숫자, 언더바(_)만 입력 가능합니다.");
@@ -204,7 +204,7 @@ public class CommonCodeCoreService
   public ResponseObj getCodeCheckDuplicate(Long parentId, String code) {
     Long existsCount = commonCodeRepository.findByParentIdCodeExists(parentId, code);
 
-    String regex = "^([A-Z]+|[0-9]+|[A-Z0-9]+(_[A-Z0-9]+)+)$";
+    String regex = "^[A-Z0-9]+(_[A-Z0-9]+)*$";
     boolean isValid = code.matches(regex);
     if (!isValid) {
       return new ResponseObj(ApiResponseCode.CONFLICT, "공통코드에 영문 대문자, 숫자, 언더바(_)만 입력 가능합니다.");