linuxc与正则表达式blog.sina.com.cn/s/blog_62b8329101010dpu.html

#include;

#include;

#include ;

#include

static char* substr(constchar*str, unsigned start, unsigned end)

{

  unsigned n &＃61;end - start;

  staticchar stbuf[256];

  strncpy(stbuf, str &＃43; start, n);

  stbuf[n] &＃61; 0;

  returnstbuf;

}

int main(int argc, char** argv)

{

  char *pattern;

  int x, z,lno &＃61; 0, cflags &＃61; 0;

  charebuf[128], lbuf[256];

  regex_t reg;

  regmatch_t pm[10];

  const size_tnmatch &＃61; 10;

  pattern &＃61; argv[1];

  z &＃61; regcomp(®, pattern,cflags);

  if (z !&＃61;0){

    regerror(z,®, ebuf, sizeof(ebuf));

    fprintf(stderr, "%s: pattern &＃39;%s&＃39; \n", ebuf, pattern);

    return 1;

  }

  while(fgets(lbuf, sizeof(lbuf), stdin)) {

    &＃43;&＃43;lno;

    if ((z &＃61; strlen(lbuf)) >0&& lbuf[z-1] &＃61;&＃61; &＃39;\n&＃39;)

      lbuf[z -1] &＃61; 0;

    z &＃61;regexec(®, lbuf, nmatch, pm, 0);

    if (z &＃61;&＃61; REG_NOMATCH) continue;

    else if(z !&＃61; 0) {

     regerror(z, ®, ebuf, sizeof(ebuf));

     fprintf(stderr, "%s:regcom(&＃39;%s&＃39;)\n", ebuf, lbuf);

     return 2;

    }

    for (x &＃61; 0; x 1; &＃43;&＃43; x) {

     if (!x) printf("d: %s\n", lno, lbuf);

     printf(" $%d&＃61;&＃39;%s&＃39;\n", x, substr(lbuf, pm[x].rm_so, pm[x].rm_eo));

    }

  }

  regfree(®);

  return0;

}

编译执行

bitwangbin&＃64;mac:~/code/c/regex > gcc regexp.c -oregexp

bitwangbin&＃64;mac:~/code/c/regex > ./regexp &＃39;regex[a-z]*&＃39;

0003: #include ;

  $0&＃61;&＃39;regex&＃39;

0020:   regex_t reg;

  $0&＃61;&＃39;regex&＃39;

0037:     z &＃61;regexec(®, lbuf, nmatch, pm, 0);

  $0&＃61;&＃39;regexec&＃39;