diff -r ee5f9615c8a7 Lib/re.py
--- a/Lib/re.py	Thu Oct 23 22:39:11 2014 +0200
+++ b/Lib/re.py	Wed Oct 29 16:58:26 2014 +0100
@@ -168,7 +168,7 @@ def search(pattern, string, flags=0):
     a match object, or None if no match was found."""
     return _compile(pattern, flags).search(string)
 
-def sub(pattern, repl, string, count=0, flags=0):
+def sub(pattern, repl, string, *, count=0, flags=0):
     """Return the string obtained by replacing the leftmost
     non-overlapping occurrences of the pattern in string by the
     replacement repl.  repl can be either a string or a callable;
@@ -177,7 +177,7 @@ def sub(pattern, repl, string, count=0, 
     a replacement string to be used."""
     return _compile(pattern, flags).sub(repl, string, count)
 
-def subn(pattern, repl, string, count=0, flags=0):
+def subn(pattern, repl, string, *, count=0, flags=0):
     """Return a 2-tuple containing (new_string, number).
     new_string is the string obtained by replacing the leftmost
     non-overlapping occurrences of the pattern in the source
@@ -188,7 +188,7 @@ def subn(pattern, repl, string, count=0,
     return a replacement string to be used."""
     return _compile(pattern, flags).subn(repl, string, count)
 
-def split(pattern, string, maxsplit=0, flags=0):
+def split(pattern, string, *, maxsplit=0, flags=0):
     """Split the source string by the occurrences of the pattern,
     returning a list containing the resulting substrings.  If
     capturing parentheses are used in pattern, then the text of all