c语言实现提取出mac地址和ipv4地址：[connection] id=Wired Connection uuid=9726bc07-731c-abf1-9f57-bab17897f5af type=ethernet permissions= [ethernet] mac-address=02:02:03:04:05:06 mac-address-blacklist= [ipv4] address1=192.168.10.20/24 dns-search= method=manual [ipv6] addr-gen-mode=stable-privacy dns-search= method=auto [proxy]

可以使用C语言中的正则表达式库来提取出MAC地址和IPv4地址。以下是一个简单的示例代码：

#include <stdio.h>
#include <regex.h>

int main() {
    char* input = "[connection] id=Wired Connection uuid=9726bc07-731c-abf1-9f57-bab17897f5af type=ethernet permissions=  [ethernet] mac-address=02:02:03:04:05:06 mac-address-blacklist=  [ipv4] address1=192.168.10.20/24 dns-search= method=manual  [ipv6] addr-gen-mode=stable-privacy dns-search= method=auto  [proxy]";
    regex_t regex;
    regmatch_t matches[2];
    int status;
    
    // 匹配MAC地址
    status = regcomp(&regex, "mac-address=([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})", REG_EXTENDED);
    if (status != 0) {
        printf("Failed to compile regex\n");
        return 1;
    }
    status = regexec(&regex, input, 2, matches, 0);
    if (status == 0) {
        printf("MAC address: %.*s\n", (int)(matches[1].rm_eo - matches[1].rm_so), input + matches[1].rm_so);
    } else {
        printf("MAC address not found\n");
    }
    regfree(&regex);
    
    // 匹配IPv4地址
    status = regcomp(&regex, "address1=([0-9]{1,3}\\.){3}[0-9]{1,3}", REG_EXTENDED);
    if (status != 0) {
        printf("Failed to compile regex\n");
        return 1;
    }
    status = regexec(&regex, input, 2, matches, 0);
    if (status == 0) {
        printf("IPv4 address: %.*s\n", (int)(matches[1].rm_eo - matches[1].rm_so), input + matches[1].rm_so);
    } else {
        printf("IPv4 address not found\n");
    }
    regfree(&regex);
    
    return 0;
}

输出结果应该是：

MAC address: 02:02:03:04:05:06
IPv4 address: 192.168.10.20