!1419 fix issue IDFNF7，对 StrMatcher 增加校验，明确禁止不带分隔符的连续变量（如 ${a}${b}），以避免歧义解析和静默的数据丢失问题。

Merge pull request !1419 from shad0wm00n/v5-dev-1224-3

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

@@ -46,6 +46,11 @@ public class StrMatcher {
 		int to;
 		for (String part : patterns) {
 			if (StrUtil.isWrap(part, "${", "}")) {
+				// 禁止连续变量，例如${a}${b}
+				if (key != null) {
+					throw new IllegalArgumentException(
+						"Consecutive variables like ${a}${b} are not supported");
+				}
 				// 变量
 				key = StrUtil.sub(part, 2, part.length() - 1);
 			} else {

hutool-core/src/test/java/cn/hutool/core/text/StrMatcherTest.java

@@ -37,4 +37,17 @@ public class StrMatcherTest {
 		assertEquals("小明", match.get("name"));
 		assertEquals("20", match.get("year"));
 	}
+
+	@Test
+	public void issueIDFNF7Test() {
+		StrMatcher strMatcher = new StrMatcher("${a}${b}");
+
+		//final Map<String, String> match = strMatcher.match("XY");
+		//Console.log(match); // 此时会输出："{b=XY}"
+
+		assertThrows(
+			IllegalArgumentException.class,
+			() -> strMatcher.match("XY")
+		);
+	}
 }