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  1. #include <stdio.h>
  2. #include <regex.h>
  3.  
  4. int
  5. regex_match (char *pattern, const char *string,
  6.              size_t sub_size, char **sub)
  7. {
  8.     const int msg_size = 200;
  9.     char      msg[msg_size];
  10.               msg[0] = '\0';
  11.     //
  12.     regmatch_t match[sub_size];
  13.     size_t     n;
  14.     size_t     m;
  15.     size_t     d;
  16.     int        status;
  17.     regex_t    re;
  18.     status = regcomp (&re, pattern, REG_EXTENDED);
  19.     if (status != 0)
  20.       {
  21.         regerror (status, &re, msg, msg_size);
  22.         fprintf (stderr, "%s\n", msg);
  23.         return (status);
  24.       }
  25.     status = regexec (&re, string, sub_size, match, 0);
  26.     if (status != 0)
  27.       {
  28.         regerror (status, &re, msg, msg_size);
  29.         fprintf (stderr, "%s\n", msg);
  30.       }
  31.     else
  32.       {
  33.         for (n=0; n < sub_size; n++)
  34.           {
  35.             for (d = 0, m = match[n].rm_so;
  36.                  m >= 0 && m < match[n].rm_eo;
  37.                  m++, d++)
  38.               {
  39.                 sub[n][d] = string[m];
  40.               }
  41.             sub[n][d] = '\0';
  42.           }
  43.       }
  44.     regfree (&re);
  45.     return (status);
  46. }
  47.  
  48. int
  49. main (void)
  50. {
  51.     int   result;
  52.     char *string       = "Ciao amore mio";
  53.     char *re           = "*Ciao (amo)re";
  54.     char  sub0[200];
  55.           sub0[0] = '\0';
  56.     char  sub1[200];
  57.           sub1[0] = '\0';
  58.     char *sub[] = {sub0, sub1};
  59.  
  60.     result = regex_match (re, string, 2, sub);
  61.  
  62.     if (result == 0)
  63.       {
  64.         printf ("Il modello \"%s\" trova corrispondenza ",
  65.                 re);
  66.         printf ("nella stringa \"%s\", precisamente ",
  67.                 string);
  68.         printf ("nella porzione \"%s\", mentre la ",
  69.                 sub[0]);
  70.         printf ("sottostringa estratta è \"%s\".\n",
  71.                 sub[1]);
  72.       }
  73.     else
  74.       {
  75.         printf ("Il modello \"%s\" ", re);
  76.         printf ("NON trova corrispondenza ");
  77.         printf ("nella stringa \"%s\"\n", string);
  78.       }
  79.     return 0;
  80. }
Success #stdin #stdout 0.02s 1852KB
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stdout
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Il modello "*Ciao (amo)re" NON trova corrispondenza nella stringa "Ciao amore mio"
https://ideone.com/Q0w9k
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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