diff --git a/pandoc_import_code.py b/pandoc_import_code.py
index c57b09a..d89cce6 100644
--- a/pandoc_import_code.py
+++ b/pandoc_import_code.py
@@ -134,7 +134,7 @@ def action(elem, doc):
         else:
             raise ValueError(f'[code import] {raw_path} should begin with @/')
 
-        rawPathRegexp = r'^(.+(?:\.([a-z]+)))(?:#([\w-]+))?(?: ?({\d(?:[,-]\d)?}))?$'
+        rawPathRegexp = r'^(.+(?:\.([a-z]+)))(?:#([\w-]+))?(?: ?({\d+(?:[,-]\d+)?}))?$'
         search = re.search(rawPathRegexp, raw_path)
 
         if search is None: