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  1. % { 
  2. #include <stdio.h> 
  3.     % 
  4. } 
  5.  
  6.     / rule section % % 
  7.     // regex for valid identifiers 
  8.     ^[a - z A - Z _][a - z A - Z 0 - 9 _] * printf("Valid Identifier"); 
  9.  
  10. // regex for invalid identifiers 
  11. ^[^a - z A - Z _] printf("Invalid Identifier"); 
  12. .; 
  13. % % 
  14.  
  15.     main() 
  16. { 
  17.     yylex(); 
  18. }
Success #stdin #stdout #stderr 0.02s 6928KB
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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/Ew4qZU/prog:18:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/mrpUMC
language:
Prolog (swi 7.6.4)
created:
29 days ago
visibility:
public

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