%{ #include <stdio.h> %} %% [a-zA-Z]+ { printf("WORD"); } %% int main() { yylex(); return 0; }
abc123
Standard output is empty
ERROR: /home/Ch9CPb/prog:13:1: Syntax error: Unexpected end of file ERROR: '$runtoplevel'/0: Undefined procedure: program/0 Exception: (3) program ? EOF: exit