Parse mathematical constants "e" and "pi"

When LaTeX expression contains mathematical constants "e" and "pi", it's impossible to run in Maxima: for example `\lim_{x\to\pi}(e^x)` converts to `limit(((e^x)),x,(pi))`
Perhaps it should be converted to `limit(((%e^x)),x,(%pi))` (with %) or is this how it should be?