any chance regular expressions are cached?

[mh at pixar.com]

I've got a bit of code in a function like this:

    s=re.sub(r'\n','\n'+spaces,s)
    s=re.sub(r'^',spaces,s)
    s=re.sub(r' *\n','\n',s)
    s=re.sub(r' *$','',s)
    s=re.sub(r'\n*$','',s)

Is there any chance that these will be cached somewhere, and save
me the trouble of having to declare some global re's if I don't
want to have them recompiled on each function invocation?

Many TIA!
Mark

-- 
Mark Harrison
Pixar Animation Studios