Comment #12 on issue 2026 by ronan.l...@gmail.com: Exact, algebraic, and integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026

Actually, if you supply the right dict-like object, it can do everything the other replace() does. For instance, something like:

class Replace(object):
    ....
    def __getitem__(self, expr):
        match = self.pattern.matches(expr)
        if match is not None:
            return self.target.replace(match)
        else:
            raise KeyError

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