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  1. %{
  2.  
  3. #include<stdio.h>
  4.  
  5. %}
  6.  
  7. %%
  8.  
  9. [a]*[b|c][a] printf("token matched \n");
  10. .* printf("input is wrong \n");
  11.  
  12. %%
  13.  
  14. int yywrap(){
  15. return 1;
  16. }
  17. int main(){
  18.  
  19. printf("correct pattern for input is : a*.(b|c).a \n");
  20.  
  21. yylex();
  22.  
  23. return 0;
  24. }
  25.  
Success #stdin #stdout #stderr 0.04s 6888KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
ERROR: /home/KcqaWW/prog:24:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit