Handling None extension properly

tools/schemacode/schemacode/validator.py

@@ -126,8 +126,10 @@ def _extension_safety(extension):
     * Period safety: https://github.com/bids-standard/bids-specification/issues/1055
     * Hopefully this function will be deprecated soon, but it will not break safe entries.
     """
-    if extension[0] == ".":
-        extension = extension[1:]
+    if extension == "None":
+        return ""
+    if "*" in extension:
+        extension = extension.replace(".","\\.")
     if "*" in extension:
         extension = extension.replace("*",".*?")
 
@@ -144,7 +146,7 @@ def _add_extensions(regex_string, variant):
         regex_extensions = "({})".format("|".join(fixed_variant_extensions))
     else:
         regex_extensions = fixed_variant_extensions[0]
-    regex_string = f"{regex_string}\\.{regex_extensions}"
+    regex_string = f"{regex_string}{regex_extensions}"
 
     return regex_string
 
@@ -213,7 +215,7 @@ def load_top_level(
                 extension = _extension_safety(extension)
                 safe_extensions.append(extension)
                 extensions_regex = "|".join(safe_extensions)
-            regex = f".*?/{top_level_filename}\\.({extensions_regex})$"
+            regex = f".*?/{top_level_filename}({extensions_regex})$"
         else:
             regex = f".*?/{top_level_filename}$"
         regex_entry = {
@@ -658,7 +660,7 @@ def validate_bids(
     Can be run from the Bash shell as:
         python -c "from schemacode import validator; validator.validate_bids\
                 ('~/.data2/datalad/000026/rawdata', schema_version='{module_path}/data/schema/',\
-                debug=False)"`
+                report_path=True, debug=False)"`
     """
 
     if isinstance(bids_paths, str):