replace方法支持包含增补字符（例如：𤰉）的字符串。脱敏等依赖该方法处理形如"𤰉秀秀"的中文时处理异常。

hutool-core/src/main/java/cn/hutool/core/text/CharSequenceUtil.java

@@ -3583,27 +3583,29 @@ public class CharSequenceUtil {
 		if (isEmpty(str)) {
 			return str(str);
 		}
-		final int strLength = str.length();
+		String originalStr = str(str);
+		int[] strCodePoints = originalStr.codePoints().toArray();
+		final int strLength = strCodePoints.length;
 		if (startInclude > strLength) {
-			return str(str);
+			return originalStr;
 		}
 		if (endExclude > strLength) {
 			endExclude = strLength;
 		}
 		if (startInclude > endExclude) {
 			// 如果起始位置大于结束位置，不替换
-			return str(str);
+			return originalStr;
 		}
 
-		final char[] chars = new char[strLength];
+		final StringBuilder stringBuilder = new StringBuilder();
 		for (int i = 0; i < strLength; i++) {
 			if (i >= startInclude && i < endExclude) {
-				chars[i] = replacedChar;
+				stringBuilder.append(replacedChar);
 			} else {
-				chars[i] = str.charAt(i);
+				stringBuilder.append(new String(strCodePoints, i, 1));
 			}
 		}
-		return new String(chars);
+		return stringBuilder.toString();
 	}
 
 	/**

hutool-core/src/test/java/cn/hutool/core/util/StrUtilTest.java

@@ -235,6 +235,17 @@ public class StrUtilTest {
 		Assert.assertEquals("103", result1);
 	}
 
+	@Test
+	public void replaceTest5() {
+		String a = "\uD853\uDC09秀秀";
+		String result = StrUtil.replace(a, 1, a.length(), '*');
+		Assert.assertEquals("\uD853\uDC09**", result);
+
+		String aa = "规划大师";
+		String result1 = StrUtil.replace(aa, 2, a.length(), '*');
+		Assert.assertEquals("规划**", result1);
+	}
+
 	@Test
 	public void upperFirstTest() {
 		StringBuilder sb = new StringBuilder("KEY");