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  1. %{
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. %}
  5.  
  6. %%option noyywrap
  7. [a-zA-Z_][a-zA-Z_0-9]*        {cout<<"Valid Identifier!! "<<endl;}
  8. [ \t\n\r]+           {}
  9. .              {cout<<"Invalid Identifier!! "<<endl;}
  10. %%
  11. int main()
  12. {
  13. 	cout<<"Enter: ";
  14. 	string s;
  15. 	getline(cin,s);
  16. 	stringstream ss(s);
  17. 	yyin = ss.rdbuf();
  18. 	return 0;
  19. }
Success #stdin #stdout #stderr 0.02s 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/tlfFGJ/prog:2:1: Syntax error: Operator expected
ERROR: /home/tlfFGJ/prog:19:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/IK2RPW
language:
Prolog (swi 7.6.4)
created:
4 days ago
visibility:
public

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