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  1. #include <stdio.h>
  2. #include <regex.h>
  3. //
  4. #define restrict /**/
  5. //
  6. //
  7. int
  8. regex_match (char *restrict pattern,
  9.              const char *restrict string,
  10.              size_t sub_size, char *restrict sub[restrict],
  11.              int cflags, int eflags, int verbose)
  12. {
  13.     const int  msg_size = 200;
  14.     char       msg[msg_size];
  15.     //
  16.     regmatch_t pmatch[sub_size];
  17.     size_t     n;
  18.     size_t     m;
  19.     size_t     d;
  20.     //
  21.     int       status;
  22.     regex_t   re;
  23.     //
  24.     status = regcomp (&re, pattern, cflags);
  25.     //
  26.     if (status != 0)
  27.       {
  28.         if (verbose)
  29.           {
  30.             regerror (status, &re, msg, msg_size);
  31.             fprintf (stderr, "%s\n", msg);
  32.           }
  33.         return (status);
  34.       }
  35.     //
  36.     status = regexec (&re, string, sub_size, pmatch,
  37.                       eflags);
  38.     //
  39.     if (status != 0)
  40.       {
  41.         if (verbose)
  42.           {
  43.             regerror (status, &re, msg, msg_size);
  44.             fprintf (stderr, "%s\n", msg);
  45.           }
  46.       }
  47.     else
  48.       {
  49.         for (n=0; n < sub_size; n++)
  50.           {
  51.             for (d = 0, m = pmatch[n].rm_so;
  52.                  m >= 0 && m < pmatch[n].rm_eo;
  53.                  m++, d++)
  54.               {
  55.                 sub[n][d] = string[m];
  56.               }
  57.             sub[n][d] = '\0';
  58.           }
  59.       }
  60.     //
  61.     regfree (&re);
  62.     //
  63.     return (status);
  64. }
  65. //
  66. //
  67. //
  68. int
  69. main (void)
  70. {
  71.     int   result;
  72.     char *string       = "Ciao amore mio";
  73.     char *re           = "Ciao (amo)re";
  74.     char  sub0[200];
  75.           sub0[0] = '\0';
  76.     char  sub1[200];
  77.           sub1[0] = '\0';
  78.     char *sub[] = {sub0, sub1};
  79.     //
  80.     result = regex_match (re, string, 2, sub, REG_EXTENDED,
  81.                           0, 1);
  82.     //
  83.     if (result == 0)
  84.       {
  85.         printf ("Il modello \"%s\" trova corrispondenza ",
  86.                 re);
  87.         printf ("nella stringa \"%s\", precisamente ",
  88.                 string);
  89.         printf ("nella porzione \"%s\", mentre la ",
  90.                 sub[0]);
  91.         printf ("sottostringa estratta è \"%s\".\n",
  92.                 sub[1]);
  93.       }
  94.     else
  95.       {
  96.         printf ("Il modello \"%s\" ", re);
  97.         printf ("NON trova corrispondenza ");
  98.         printf ("nella stringa \"%s\"\n", string);
  99.       }
  100.     return 0;
  101. }
Success #stdin #stdout 0.01s 1852KB
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Standard input is empty
stdout
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Il modello "Ciao (amo)re" trova corrispondenza nella stringa "Ciao amore mio", precisamente nella porzione "Ciao amore", mentre la sottostringa estratta è "amo".
https://ideone.com/J0O8h
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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