[symbols]

  [white_space[
    type = token
    lex_extra_action = "if memchr(yytext, '\n', yyleng) context->line++;"
    regex = "[ \n\t\r]+" 
  ]

  [all_characters[
    type = non-terminal
    regex = "[[:print:]]"
    #lex_as = yytext[0]
  ]

  [test[
    type = token
    dings = bums
    regex = "bumsdings"
  ]