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  1. %{
  2. 	#undef yywrap
  3. 	#define yywrap()
  4. 	#include<stdio.h>
  5. }%
  6.  
  7.  
  8. %%
  9. ((http)|(ftp))s?:\/\/[a-zA-Z0-9]{2, }(\.[a-z]{2, })
  10. 	+(\/[a-zA-Z0-9+=?]*)*{printf("\nURL Valid\n");}
  11.  
  12. +{printf("\nURL Inalid\n");}
  13.  
  14. %%
  15.  
  16. // driver program
  17. void main()
  18. {
  19. 	printf("\nEnter URL:");
  20. 	yylex();
  21. 	printf("\n");
  22. 	return 0;
  23. }
Success #stdin #stdout #stderr 0.02s 7012KB
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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/buYZq8/prog:23:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/GY7cGa
language:
Prolog (swi 7.6.4)
created:
13 days ago
visibility:
public

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