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  1. %{
  2. #include <stdio.h>
  3. int flag = 0;
  4.  
  5. // Required to avoid linker error on macOS
  6. int yywrap() {
  7.     return 1;
  8. }
  9. %}
  10.  
  11. %%
  12.  
  13. [a-z0-9_]+@[a-z]+\.com     { flag = 1; }
  14.  
  15. %%
  16.  
  17. int main() {
  18.     yylex();
  19.     if (flag == 1)
  20.         printf("This email is accepted\n");
  21.     else
  22.         printf("This email is not accepted\n");
  23.     return 0;
  24. }
  25.  
Success #stdin #stdout #stderr 0.03s 6916KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/ozy81k/prog:24:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/iS32Wn
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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