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  1. %{
  2. #include <stdio.h>
  3. #include <string.h>
  4. %}
  5.  
  6. %%
  7.  
  8. [a-zA-Z_][a-zA-Z0-9_]*    { printf("Valid Identifier\n"); }
  9. [^a-zA-Z_]                { printf("Invalid Identifier\n"); }
  10.  
  11. %%
  12.  
  13. int yywrap() {
  14.     return 1;
  15. }
  16.  
  17. int main() {
  18.     yylex();
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout #stderr 0.03s 6844KB
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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/OVSYCI/prog:20:1: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/UtJ3rW
language:
Prolog (swi 7.6.4)
created:
11 days ago
visibility:
public

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