If Poets Wrote Parsers

I'm not talking of shoe string falt'ring step,
  But of a wish to push, pop, and retreat,
  Not just a momentary fill-get-put,
  But of some greater pattern search than grep.
  If your expression less regular kep'
Traversing, and trees refused to grow yet
  Buffered screams remained for parsing still, out
  Then! No need to stack faults one and one up
  Over the other, leading to recurses
  Of bitter thoughts, because what's left is right,
  And recursing let to descent on left
  Goes nowhere fast. So, Muse, if your purse is
  Flushed of its tokens, and if must, take flight,
  Just don't double pass by what you've cleft.

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