any chance regular expressions are cached?

[John Machin]

On Mar 10, 3:42 pm, John Machin <sjmac... at lexicon.net> wrote rather
baroquely:
> ...>>> def myfunc(s, spaces):
>
> ...     return '\n'.join(spaces + x.rstrip() if x.rstrip() else '' for
> x in s.splitlines())

Better:
...     return '\n'.join((spaces + x).rstrip() for x in
s.splitlines())