修复 StrMatcher连续变量解析导致的歧义问题（pr#1419@Gitee）

hutool-core/src/main/java/cn/hutool/v7/core/text/placeholder/StrMatcher.java

@@ -93,8 +93,9 @@ public class StrMatcher {
 	 *
 	 * @param pattern 表达式，使用${XXXX}作为变量占位符
 	 * @return 表达式
+	 * @throws IllegalArgumentException 连续变量不支持，例如：${a}${b}
 	 */
-	private static List<String> parse(final String pattern) {
+	private static List<String> parse(final String pattern) throws IllegalArgumentException {
 		final List<String> patterns = new ArrayList<>();
 		final int length = pattern.length();
 		char c = 0;
@@ -107,6 +108,13 @@ public class StrMatcher {
 			if (inVar) {
 				part.append(c);
 				if ('}' == c) {
+					if (!patterns.isEmpty()) {
+						final String lastPart = patterns.get(patterns.size() - 1);
+						if (StrUtil.isWrap(lastPart, "${", "}")) {
+							// issue#IDFNF7 连续变量会导致歧义，例如：${a}${b} 不支持
+							throw new IllegalArgumentException(StrUtil.format("Consecutive variables '{}{}' are not supported", lastPart, part.toString()));
+						}
+					}
 					// 变量结束
 					inVar = false;
 					patterns.add(part.toString());

hutool-core/src/test/java/cn/hutool/v7/core/text/StrMatcherTest.java

@@ -22,6 +22,8 @@ import org.junit.jupiter.api.Test;
 
 import java.util.Map;
 
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
 public class StrMatcherTest {
 
 	@Test
@@ -54,4 +56,12 @@ public class StrMatcherTest {
 		Assertions.assertEquals("小明", match.get("name"));
 		Assertions.assertEquals("20", match.get("year"));
 	}
+
+	@Test
+	public void issueIDFNF7Test() {
+		assertThrows(
+			IllegalArgumentException.class,
+			() -> new StrMatcher("${a}${b}")
+		);
+	}
 }