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Top Forums Programming Wildcard Pattern Matching In C Post 302976648 by Azrael on Saturday 2nd of July 2016 11:49:46 AM
Old 07-02-2016
Don't get me wrong, regex is a great and wonderful tool. However, from what I understand regex in C is re-compiled every time it runs. That would not be so bad if I was not planning to call this code later many times with threads on a system where resources are very tight. For that reason I'm trying to stay away from them if possible.

I tried looking at fnmatch earlier. I changed my while loop to this, but the pattern was not matched:

Code:
    while(fgets(line, sizeof(line), fp)) {
        if (fnmatch(newhold, line, 100) == 0){
        i++;
      }
    }

I looked at the man page and some examples online and appears the second parameter to fnmatch() needs to be a constant or a struct value. Either that or I'm doing something wrong I don't know?
 

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FNMATCH(3)						     Linux Programmer's Manual							FNMATCH(3)

NAME
fnmatch - match filename or pathname SYNOPSIS
#include <fnmatch.h> int fnmatch(const char *pattern, const char *string, int flags); DESCRIPTION
The fnmatch() function checks whether the string argument matches the pattern argument, which is a shell wildcard pattern. The flags argument modifies the behavior; it is the bitwise OR of zero or more of the following flags: FNM_NOESCAPE If this flag is set, treat backslash as an ordinary character, instead of an escape character. FNM_PATHNAME If this flag is set, match a slash in string only with a slash in pattern and not by an asterisk (*) or a question mark (?) metacharacter, nor by a bracket expression ([]) containing a slash. FNM_PERIOD If this flag is set, a leading period in string has to be matched exactly by a period in pattern. A period is considered to be leading if it is the first character in string, or if both FNM_PATHNAME is set and the period immediately follows a slash. FNM_FILE_NAME This is a GNU synonym for FNM_PATHNAME. FNM_LEADING_DIR If this flag (a GNU extension) is set, the pattern is considered to be matched if it matches an initial segment of string which is followed by a slash. This flag is mainly for the internal use of glibc and is implemented only in certain cases. FNM_CASEFOLD If this flag (a GNU extension) is set, the pattern is matched case-insensitively. RETURN VALUE
Zero if string matches pattern, FNM_NOMATCH if there is no match or another nonzero value if there is an error. CONFORMING TO
POSIX.2. The FNM_FILE_NAME, FNM_LEADING_DIR, and FNM_CASEFOLD flags are GNU extensions. SEE ALSO
sh(1), glob(3), scandir(3), wordexp(3), glob(7) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2000-10-15 FNMATCH(3)
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