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      1 # lex_re3.py
      2 #
      3 # Regular expression rule matches empty string
      4 
      5 import sys
      6 if ".." not in sys.path: sys.path.insert(0,"..")
      7 
      8 import ply.lex as lex
      9 
     10 tokens = [
     11     "PLUS",
     12     "MINUS",
     13     "NUMBER",
     14     "POUND",
     15     ]
     16 
     17 t_PLUS = r'\+'
     18 t_MINUS = r'-'
     19 t_NUMBER = r'(\d+)'
     20 t_POUND = r'#'
     21 
     22 def t_error(t):
     23     pass
     24 
     25 
     26 
     27 lex.lex()
     28 
     29 
     30