fix bug

hutool-core/src/main/java/cn/hutool/core/comparator/StrLengthComparator.java

@@ -0,0 +1,25 @@
+package cn.hutool.core.comparator;
+
+import java.util.Comparator;
+
+/**
+ * 字符串长度比较器，短在前
+ *
+ * @author looly
+ * @since 5.8.9
+ */
+public class StrLengthComparator implements Comparator<CharSequence> {
+	/**
+	 * 单例的字符串长度比较器，短在前
+	 */
+	public static final StrLengthComparator INSTANCE = new StrLengthComparator();
+
+	@Override
+	public int compare(final CharSequence o1, final CharSequence o2) {
+		int result = Integer.compare(o1.length(), o2.length());
+		if (0 == result) {
+			result = CompareUtil.compare(o1.toString(), o2.toString());
+		}
+		return result;
+	}
+}

hutool-core/src/main/java/cn/hutool/core/regex/ReUtil.java

@@ -1,6 +1,7 @@
 package cn.hutool.core.regex;
 
 import cn.hutool.core.collection.SetUtil;
+import cn.hutool.core.comparator.StrLengthComparator;
 import cn.hutool.core.convert.Convert;
 import cn.hutool.core.lang.Assert;
 import cn.hutool.core.lang.Validator;
@@ -878,7 +879,8 @@ public class ReUtil {
 		final Matcher matcher = pattern.matcher(content);
 		boolean result = matcher.find();
 		if (result) {
-			final Set<String> varNums = findAll(PatternPool.GROUP_VAR, replacementTemplate, 1, new HashSet<>());
+			final Set<String> varNums = findAll(PatternPool.GROUP_VAR, replacementTemplate, 1,
+					new TreeSet<>(StrLengthComparator.INSTANCE.reversed()));
 			final StringBuffer sb = new StringBuffer();
 			do {
 				String replacement = replacementTemplate;

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

@@ -204,4 +204,12 @@ public class ReUtilTest {
 		Assert.assertEquals(map.get("month"), "10");
 		Assert.assertEquals(map.get("day"), "11");
 	}
+
+	@Test
+	public void issuesI5TQDRTest(){
+		final Pattern patternIp = Pattern.compile("((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})\\.((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})\\.((2(5[0-5]|[0-4]\\d))"
+				+ "|[0-1]?\\d{1,2})\\.((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})");
+		final String s = ReUtil.replaceAll("1.2.3.4", patternIp, "$1.**.**.$10");
+		Assert.assertEquals("1.**.**.4", s);
+	}
 }