fix clean string

nodes/utils.py

@@ -1,11 +1,9 @@
 import imageio
+import re
 
 def get_video_metadata(video_path):
     reader = imageio.get_reader(video_path)
     return reader.get_meta_data()
 
 def clean_string(input_string):
-    invalid_chars = ['\\', '/', ':', '*', '?', '"', '<', '>', '|',"#"," ","!"]
-    cleaned_string = ''.join(c if c not in invalid_chars else '_' for c in input_string)
-    cleaned_string = cleaned_string.strip(" .")
-    return cleaned_string
+    return re.sub("[^A-Za-z]", "", s)