fork download
copy 
  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <regex.h>
  4.  
  5.  
  6. static const char *char_match = "^('(.|([\\]0))')";
  7.  
  8. int main()
  9. {
  10.     regex_t re = {0};
  11.     if (regcomp(&re, char_match, REG_EXTENDED) != 0)
  12.     {
  13.         perror("Failed to compile RE.");
  14.         exit(EXIT_FAILURE);
  15.     }
  16.  
  17.     // expected successed
  18.     const char *good[] =
  19.     {
  20.         "'a'",
  21.         "'\\0'",
  22.         "'0'",
  23.         "'\\'"
  24.     };
  25.     for (int i=0;i<sizeof(good)/sizeof(good[0]);++i)
  26.     {
  27.         int match = regexec(&re, good[i], 0, NULL, 0);
  28.         printf("good:%d\n", match);
  29.     }
  30.  
  31.     const char *bad[] =
  32.     {
  33.         "'ab'",
  34.         "'a",
  35.         "\\",
  36.         "\\\0",
  37.         "\0\\\0"
  38.     };
  39.     for (int i=0;i<sizeof(bad)/sizeof(bad[0]);++i)
  40.     {
  41.         int match = regexec(&re, bad[i], 0, NULL, 0);
  42.         printf("bad:%d\n", match);
  43.     }
  44.  
  45.     regfree(&re);
  46.     return 0;
  47. }
Success #stdin #stdout 0s 1964KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
good:0
good:0
good:0
good:0
bad:1
bad:1
bad:1
bad:1
bad:1
https://ideone.com/TEQaeC
language:
C99 (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!