I'm wondering if maybe it's the last chicken in the shop, I mean, the last line in a block, and that \n should be (\n|\z), i.e. "a newline or the end of the file". I got caught by that one recently...

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“Every bit of code is either naturally related to the problem at hand, or else it's an accidental side effect of the fact that you happened to solve the problem using a digital computer.”
M-J D