fix: qa regex (#1738)

api/core/indexing_runner.py

         return text
 
     def format_split_text(self, text):
-        regex = r"Q\d+:\s*(.*?)\s*A\d+:\s*([\s\S]*?)(?=Q|$)"
-        matches = re.findall(regex, text, re.MULTILINE)
+        regex = r"Q\d+:\s*(.*?)\s*A\d+:\s*([\s\S]*?)(?=Q\d+:|$)" 
+        matches = re.findall(regex, text, re.UNICODE)
 
         return [
             {