diff --git a/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/util/PlusoneStrUtil.java b/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/util/PlusoneStrUtil.java
index f6ce284..238dc49 100644
--- a/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/util/PlusoneStrUtil.java
+++ b/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/util/PlusoneStrUtil.java
@@ -1,9 +1,5 @@
 package xyz.zhouxy.plusone.util;
 
-import java.util.Objects;
-import java.util.regex.Pattern;
-
-import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
 /**
@@ -27,17 +23,4 @@ public class PlusoneStrUtil {
         return StringUtils.hasLength(value) ? value : EMPTY_STR;
     }
 
-    public static String checkString(String value, String regex, String message) {
-        Assert.notNull(value, message);
-        Assert.isTrue(Pattern.matches(regex, value), message);
-        return value;
-    }
-
-    public static String checkStringNullable(String value, String regex, String message) {
-        return Objects.nonNull(value) ? checkString(value, regex, message) : null;
-    }
-
-    public static String checkStringOrDefault(String value, String regex, String message) {
-        return StringUtils.hasText(value) ? checkString(value, regex, message) : "";
-    }
 }