C/C++正则表达式-创新互联

C 正则表达式中IP的判定。

代码:   ./func   "^([0-9]{1,3}\.){3}[0-9]{1,3}$"  "192.168.42.168"

#include#include#includeint main(int argc,char** argv)
{
    if(argc != 3)
    {
         printf("usage:%s regexstring and text\n",argv[0]);
    }
   
    const char* p_regex_str = argv[1];
    const char* p_txt = argv[2];
    regex_t oregex;
    int ret = 0;
    char emsg[1024] = {0};
    size_t emsg_len = 0;

    if(( ret = regcomp(&oregex,p_regex_str,REG_EXTENDED|REG_NOSUB)) == 0 )
    {
        if( (ret = regexec(&oregex,p_txt,0,NULL,0)) == 0 )
        {
             printf("%s matches %s\n",p_txt,p_regex_str);
             regfree(&oregex);
             return 0;  
        }    
    }

    emsg_len = regerror(ret,&oregex,emsg,sizeof(emsg));
    emsg_len = emsg_len< sizeof(emsg)? emsg_len : sizeof(emsg) -1;
    emsg[emsg_len] = '\0';
    regfree(&oregex);
    return 1;
}

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