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  1. %{
  2. #include <stdio.h>
  3. %}
  4.  
  5. %%
  6. (0[1-9]|[12][0-9]|3[01])/(0[1-9]|1[0-2])/(19[0-9]{2}|20[0-9]{2})   { printf("Valid DOB\n"); }
  7. .*                                                                 { printf("Invalid DOB\n"); }
  8. %%
  9.  
  10. int main() {
  11.     printf("Enter DOB (DD/MM/YYYY): ");
  12.     yylex();
  13.     return 0;
  14. }
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/oHYZjd/prog:14:0: Syntax error: Unexpected end of file
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/10lEgb
language:
Prolog (swi 7.6.4)
created:
3 hours ago
visibility:
public

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