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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. ^[a-zA-Z_][a-zA-Z0-9_]*$   { printf("Valid Identifier\n"); }
  7. .*                        { printf("Invalid Identifier\n"); }
  8. %%
  9.  
  10. int main()
  11. {
  12.     printf("Enter a string:\n");
  13.     yylex();
  14.     return 0;
  15. }
  16.  
  17. int yywrap()
  18. {
  19.     return 1;
  20. }
Success #stdin #stdout #stderr 0.03s 6864KB
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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/vulHYO/prog:20:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/oRAiKr
language:
Prolog (swi 7.6.4)
created:
1 day ago
visibility:
public

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