Remove regsub, reconvert, regex, regex_syntax and everything under lib-old.
diff --git a/Demo/scripts/update.py b/Demo/scripts/update.py
index 32ad6c8..c936026 100755
--- a/Demo/scripts/update.py
+++ b/Demo/scripts/update.py
@@ -8,10 +8,10 @@
 
 import os
 import sys
-import regex
+import re
 
-pat = '^\([^: \t\n]+\):\([1-9][0-9]*\):'
-prog = regex.compile(pat)
+pat = '^([^: \t\n]+):([1-9][0-9]*):'
+prog = re.compile(pat)
 
 class FileObj:
     def __init__(self, filename):