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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. ^a(a|b)*b$      { printf("Accepted: String belongs to L\n"); }
  7. ^[ab]+$         { printf("Rejected: Does not start with 'a' and end with 'b'\n"); }
  8. .*              { printf("Rejected: Invalid characters (only a and b allowed)\n"); }
  9. %%
  10.  
  11. int main()
  12. {
  13.     printf("Enter a string: ");
  14.     yylex();
  15.     return 0;
  16. }
  17.  
  18. int yywrap()
  19. {
  20.     return 1;
  21. }
  22.  
Success #stdin #stdout #stderr 0.02s 6900KB
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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/8fG3F8/prog:21:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/cZTVkL
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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