diff --git a/src/main/java/com/gdschongik/gdsc/domain/member/domain/Member.java b/src/main/java/com/gdschongik/gdsc/domain/member/domain/Member.java
index b3f77d146..4c518d7c1 100644
--- a/src/main/java/com/gdschongik/gdsc/domain/member/domain/Member.java
+++ b/src/main/java/com/gdschongik/gdsc/domain/member/domain/Member.java
@@ -140,4 +140,16 @@ private void updateNickname(String nickname) {
             this.nickname = nickname;
         }
     }
+
+    private void validateStringNotNull(String value) {
+        if (value == null) {
+            throw new CustomException(ErrorCode.METHOD_ARGUMENT_NULL);
+        }
+    }
+
+    private void validateRegex(String value, String regex) {
+        if (!value.matches(regex)) {
+            throw new CustomException(ErrorCode.REGEX_VIOLATION);
+        }
+    }
 }