| # lex_re3.py | |
| # | |
| # Regular expression rule matches empty string | |
| import sys | |
| if ".." not in sys.path: sys.path.insert(0,"..") | |
| import ply.lex as lex | |
| tokens = [ | |
| "PLUS", | |
| "MINUS", | |
| "NUMBER", | |
| "POUND", | |
| ] | |
| t_PLUS = r'\+' | |
| t_MINUS = r'-' | |
| t_NUMBER = r'(\d+)' | |
| t_POUND = r'#' | |
| def t_error(t): | |
| pass | |
| lex.lex() | |