diff --git a/src/main/java/com/hideyoshi/backendportfolio/util/validator/email/valid/EmailValidator.java b/src/main/java/com/hideyoshi/backendportfolio/util/validator/email/valid/EmailValidator.java
index 5881814..65beae4 100644
--- a/src/main/java/com/hideyoshi/backendportfolio/util/validator/email/valid/EmailValidator.java
+++ b/src/main/java/com/hideyoshi/backendportfolio/util/validator/email/valid/EmailValidator.java
@@ -4,15 +4,14 @@ import lombok.RequiredArgsConstructor;
 
 import javax.validation.ConstraintValidator;
 import javax.validation.ConstraintValidatorContext;
+import java.util.Objects;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 @RequiredArgsConstructor
 public class EmailValidator implements ConstraintValidator<ValidEmail, String> {
 
-    private Pattern pattern;
-    private Matcher matcher;
-    private static final String EMAIL_PATTERN = "^[_A-Za-z\\d-+]+(.[_A-Za-z\\d-]+)*@+[A-Za-z\\d-]+(.[A-Za-z\\d]+)*(.[A-Za-z]{2,})$";
+    private static final String EMAIL_PATTERN = "^[\\w-\\.]+@([\\w-]+\\.)+[\\w-]{2,4}$";
 
     @Override
     public void initialize(ValidEmail constraintAnnotation) {
@@ -24,8 +23,12 @@ public class EmailValidator implements ConstraintValidator<ValidEmail, String> {
     }
 
     private boolean validateEmail(String email) {
-        pattern = Pattern.compile(EMAIL_PATTERN);
-        matcher = pattern.matcher(email);
+        if (Objects.isNull(email)) {
+            return false;
+        }
+
+        Pattern pattern = Pattern.compile(EMAIL_PATTERN);
+        Matcher matcher = pattern.matcher(email);
 
         return matcher.matches();
     }