>>> help(sre)
...
   "$"      Matches the end of the string.
...
   \Z       Matches only at the end of the string.
...
M  MULTILINE   "^" matches the beginning of lines as well as the string.
               "$" matches the end of lines as well as the string.

The docs for "$" are misleading - it actually matches in newline-specific ways which the module's built-in docs don't hint at.  The MULTILINE docs don't clarify this.

I'd also like to see "from sre import __doc__" added to the end of re.py; lack of "help(re)" is a bigger problem than having slightly wrong auto-generated docs for the re module itself.