fix

app/Libs/Helpers.php

@@ -5119,9 +5119,9 @@ function splitContent($content) {
             // 获取当前章节标题
             $titleLine = trim($matches[0][$i][0]);
             // 去除标题开头的特殊符号
-            $cleanTitle = preg_replace('/^[#*·\-_=\s]+/', '', $titleLine);
+            $cleanTitle = preg_replace('/^[#*·\-_=\s]+/u', '', $titleLine);
             // 去除标题结尾的冒号和特殊符号
-            $cleanTitle = preg_replace('/[#*·:：\s]+$/', '', $cleanTitle);
+            $cleanTitle = preg_replace('/[#*·:：\s]+$/u', '', $cleanTitle);
             $cleanTitle = trim($cleanTitle);
             
             // 获取当前标题的结束位置

app/Services/DeepSeek/DeepSeekService.php

@@ -13380,9 +13380,9 @@ Q版卡通风格，头大身小，造型圆润可爱，线条简单，色彩明
                 // 获取当前章节标题
                 $titleLine = trim($matches[0][$i][0]);
                 // 去除标题开头的特殊符号
-                $cleanTitle = preg_replace('/^[#*·\-_=\s]+/', '', $titleLine);
+                $cleanTitle = preg_replace('/^[#*·\-_=\s]+/u', '', $titleLine);
                 // 去除标题结尾的冒号和特殊符号
-                $cleanTitle = preg_replace('/[#*·:：\s]+$/', '', $cleanTitle);
+                $cleanTitle = preg_replace('/[#*·:：\s]+$/u', '', $cleanTitle);
                 $cleanTitle = trim($cleanTitle);
                 
                 // 获取当前标题的结束位置
@@ -13482,6 +13482,12 @@ Q版卡通风格，头大身小，造型圆润可爱，线条简单，色彩明
                 Utils::throwError('20003:不支持的文件格式，支持：txt、pdf');
         }
 
+        // 移除非法 UTF-8 字节，避免后续 JSON 编码或正则解析异常
+        if (!mb_check_encoding($content, 'UTF-8')) {
+            $cleaned = @iconv('UTF-8', 'UTF-8//IGNORE', $content);
+            $content = $cleaned === false ? $content : $cleaned;
+        }
+
         return $content;
     }