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Full Discussion: Wildcard Pattern Matching In C
Top Forums Programming Wildcard Pattern Matching In C Post 302976672 by Azrael on Sunday 3rd of July 2016 01:14:22 PM
Old 07-03-2016
Sorry, I thought I had provided the contents of the file earlier. Here it is again with just the following for testing:

Code:
$ cat /var/log/apache2/other_vhosts_access.log
03/Jul blah pattern

I did not know regex in C and grep/egrep were so closely related. I did as Jim suggested and saw nothing was matched:

Code:
$ egrep "03?Jul*pattern" /var/log/apache2/other_vhosts_access.log | wc -l
0

I changed this to the following and it was matched:

Code:
egrep "03.Jul.*pattern" /var/log/apache2/other_vhosts_access.log | wc -l
1

Still not getting a match when I try applying this to C though:
Code:
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <regex.h>

int main() {

   char newhold[40];

        regex_t re;
        time_t current = time(NULL);
        char day[10];
        char mon[10];
        int retval = 0;

        strftime(day, sizeof(day), "%d", localtime(&current));
        strncat( newhold, day, 10 );
        strncat( newhold, ".", 2 );
        strftime(mon, sizeof(mon), "%b", localtime(&current));
        strncat( newhold, mon, 10 );
        strncat( newhold, ".*", 4 );
        strncat( newhold, "pattern", 10 );

     if(regcomp(&re , newhold, REG_NOMATCH) != 0 ){
         return 1;
     }

    FILE *fp;
    fp = fopen("/var/log/apache2/other_vhosts_access.log", "r");
    char line[100];
    unsigned int i = 0;

    while(fgets(line, sizeof(line), fp)) {
        if ((retval = regexec(&re, line, 0, NULL, 0)) == 0){
        i++;
      }
    }
  printf("%s %d\n", newhold, i );
  fclose(fp);
  return 0;
}

I also tried working with regerror(), but had trouble applying the few examples I was able to find.
 

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LEARN ABOUT DEBIAN

gmatch

gmatch(3GEN)                                         String Pattern-Matching Library Functions                                        gmatch(3GEN)

NAME

       gmatch - shell global pattern matching

SYNOPSIS

       cc [ flag ... ] file ... -lgen [ library ... ]
       #include <libgen.h>

       int gmatch(const char *str, const char *pattern);

DESCRIPTION

       gmatch()  checks  whether  the  null-terminated string str matches the null-terminated pattern string pattern. See the sh(1), section  File
       Name Generation, for a discussion of pattern matching. A backslash () is used as an escape character in pattern strings.

RETURN VALUES

       gmatch() returns non-zero if the pattern matches the string, zero if the pattern does not.

EXAMPLES

       Example 1: Examples of gmatch() function.

       In the following example, gmatch() returns non-zero (true) for all strings with "a" or "-" as their last character.

              char *s;
              gmatch (s, "*[a-]" )

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |MT-Level                     |MT-Safe                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       sh(1), attributes(5)

NOTES

       When compiling multithreaded applications, the _REENTRANT flag must be defined on the compile line.  This flag should only be used in  mul-
       tithreaded applications.

SunOS 5.10                                                          29 Dec 1996                                                       gmatch(3GEN)
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