【修复】斜体匹配规则

@@ -555,7 +555,7 @@ class StrikeMd extends InlineMd {
 class ItalicMd extends InlineMd {
 class ItalicMd extends InlineMd {
   @override
   @override
   RegExp get exp => RegExp(
   RegExp get exp => RegExp(
-    r"(?<!\*)\*(?<!\s)(.+?)(?<!\s)\*(?!\*)|\_(?<!\s)(.+?)(?<!\s)\_",
+    r"(?<!\*)\*(?<!\s)([^\n*]+?)(?<!\s)\*(?!\*)|\_(?<!\s)([^\n_]+?)(?<!\s)\_",
     dotAll: true,
     dotAll: true,
   );
   );