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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <regex.h>
  4.  
  5. int main ()
  6. {
  7.     char * source = "* * * * 00 00 00 ; reboot";
  8.     char *regexString = "^(\\*|[[:digit:]]{1,9})[[:blank:]](\\*|[[:digit:]]{2})[[:blank:]](\\*|[[:digit:]]{2})[[:blank:]](\\*|[[:alpha:]]{3})[[:blank:]](\\*|[[:digit:]]{2})[[:blank:]](\\*|[[:digit:]]{2})[[:blank:]](\\*|[[:digit:]]{2})[[:blank:]];[[:blank:]]([[:print:]]*)";
  9.     size_t maxMatches = 3; //I've tried for sevrals values, 2, 3 ... same Output
  10.     size_t maxGroups = 9; // 8 groups + 1 for whole match
  11.  
  12.     regex_t regexCompiled;
  13.     regmatch_t groupArray[maxGroups];
  14.     unsigned int m;
  15.     char * cursor;
  16.  
  17.     if (regcomp(&regexCompiled, regexString, REG_EXTENDED))
  18.     {
  19.         printf("Could not compile regular expression.\n");
  20.         return 1;
  21.     };
  22.  
  23.     m = 0;
  24.     cursor = source;
  25.     for (m = 0; m < maxMatches; m ++)
  26.     {
  27.         if (regexec(&regexCompiled, cursor, maxGroups, groupArray, 0))
  28.             break;  // No more matches
  29.  
  30.         unsigned int g = 0;
  31.         unsigned int offset = 0;
  32.         for (g = 0; g < maxGroups; g++)
  33.         {
  34.             if (groupArray[g].rm_so == (size_t)-1)
  35.                 break;  // No more groups
  36.  
  37.             if (g == 0)
  38.                 offset = groupArray[g].rm_eo;
  39.  
  40.             char cursorCopy[strlen(cursor) + 1];
  41.             strcpy(cursorCopy, cursor);
  42.             cursorCopy[groupArray[g].rm_eo] = 0;
  43.             printf("Match %u, Group %u: [%2u-%2u]: %s\n",
  44.                    m, g, groupArray[g].rm_so, groupArray[g].rm_eo,
  45.                    cursorCopy + groupArray[g].rm_so);
  46.         }
  47.         cursor += offset;
  48.     }
  49.  
  50.     regfree(&regexCompiled);
  51.  
  52.     return 0;
  53. }
Success #stdin #stdout 0s 4520KB
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stdin
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Standard input is empty
stdout
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Match 0, Group 0: [ 0-25]: * * * * 00 00 00 ; reboot
Match 0, Group 1: [ 0- 1]: *
Match 0, Group 2: [ 2- 3]: *
Match 0, Group 3: [ 4- 5]: *
Match 0, Group 4: [ 6- 7]: *
Match 0, Group 5: [ 8-10]: 00
Match 0, Group 6: [11-13]: 00
Match 0, Group 7: [14-16]: 00
Match 0, Group 8: [19-25]: reboot
https://ideone.com/UXWyrp
language:
C (gcc 8.3)
created:
4 years ago
visibility:
secret

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