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  1. %{
  2. #include<stdio.h>
  3. %}
  4.  
  5. %%
  6. [0-9] { printf("digit\n"); }
  7. [a-zA-Z] { printf("character\n"); }
  8. . { /* do nothing */ }
  9. %%
  10.  
  11. int main() {
  12. yylex(); // Start lexical analysis
  13. return 0;
  14. }
  15.  
  16. int yywrap() {
  17. return 1; // Indicates end of file
  18. }
  19.  
Success #stdin #stdout #stderr 0.03s 6944KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
ERROR: /home/RwqARA/prog:2:1: Syntax error: Operator expected
ERROR: /home/RwqARA/prog:18:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit