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Feb 27th, 2017
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  1. R_EXP [eE][+-]?[0-9]+
  2. R_INT [0-9]+(([0-9]|_)*[0-9]+)?
  3. REALLIT ({R_INT}\.({R_INT}?|{R_EXP}?))|(\.{R_INT}{R_EXP}?)|({R_INT}{R_EXP})|(({R_INT})\.{R_INT}{R_EXP})
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