用正则表达式检查是ip否为内网地址

• PHP

function isIntranet($ip)
{/* IPV4内网地址A 类10.0.0.0～10.255.255.255B 类172.16.0.0～172.31.255.255C 类192.168.0.0～192.168.255.255*/// 检查是否为 IPv4 内网地址if (preg_match('/^10\./', $ip)) return true;if (preg_match('/^172\.(1[6-9]|2[0-9]|3[0-1])\./', $ip)) return true;if (preg_match('/^192\.168\./', $ip)) return true;/* IPV6内网地址ULA地址: fc00::/7 (fc00:: - fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff)链路本地地址: fe80::/10 (fe80:: - febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff)*/// 检查是否为 IPv6 内网地址if (preg_match('/^f[c-d][0-9a-f]{2}:/i', $ip)) return true;  // 匹配 fc00::/7 (包括 fc00:: 和 fdff:: 范围)if (preg_match('/^fe[89ab][0-9a-f]:/i', $ip)) return true;   // 匹配 fe80::/10 (包括 fe80:: 到 febf:: 范围)return false;
}

• Java

java">import java.util.regex.Pattern;public class IPUtils {public static boolean isIntranet(String ip) {// IPV4 内网地址正则表达式String ipv4Pattern10 = "^10\\.";String ipv4Pattern172 = "^172\\.(1[6-9]|2[0-9]|3[0-1])\\.";String ipv4Pattern192 = "^192\\.168\\.";// IPV6 内网地址正则表达式String ipv6PatternFC = "^f[c-d][0-9a-f]{2}:";String ipv6PatternFE = "^fe[89ab][0-9a-f]:";// 匹配 IPv4 内网地址if (Pattern.matches(ipv4Pattern10, ip)) return true;if (Pattern.matches(ipv4Pattern172, ip)) return true;if (Pattern.matches(ipv4Pattern192, ip)) return true;// 匹配 IPv6 内网地址if (Pattern.matches(ipv6PatternFC, ip)) return true;if (Pattern.matches(ipv6PatternFE, ip)) return true;return false;}public static void main(String[] args) {System.out.println(isIntranet("10.0.0.1"));       // trueSystem.out.println(isIntranet("fc00::1"));        // trueSystem.out.println(isIntranet("172.16.0.1"));     // trueSystem.out.println(isIntranet("192.168.0.1"));    // trueSystem.out.println(isIntranet("fe80::1"));        // trueSystem.out.println(isIntranet("8.8.8.8"));        // false}
}

• Golang

package mainimport ("fmt""regexp"
)func isIntranet(ip string) bool {// 定义 IPv4 内网地址的正则表达式ipv4Pattern10 := `^10\.`ipv4Pattern172 := `^172\.(1[6-9]|2[0-9]|3[0-1])\.`ipv4Pattern192 := `^192\.168\.`// 定义 IPv6 内网地址的正则表达式ipv6PatternFC := `^f[c-d][0-9a-f]{2}:`ipv6PatternFE := `^fe[89ab][0-9a-f]:`// 匹配 IPv4 内网地址if matched, _ := regexp.MatchString(ipv4Pattern10, ip); matched {return true}if matched, _ := regexp.MatchString(ipv4Pattern172, ip); matched {return true}if matched, _ := regexp.MatchString(ipv4Pattern192, ip); matched {return true}// 匹配 IPv6 内网地址if matched, _ := regexp.MatchString(ipv6PatternFC, ip); matched {return true}if matched, _ := regexp.MatchString(ipv6PatternFE, ip); matched {return true}return false
}func main() {fmt.Println(isIntranet("10.0.0.1"))      // truefmt.Println(isIntranet("fc00::1"))       // truefmt.Println(isIntranet("172.16.0.1"))    // truefmt.Println(isIntranet("192.168.0.1"))   // truefmt.Println(isIntranet("fe80::1"))       // truefmt.Println(isIntranet("8.8.8.8"))       // false
}

• C

#include <stdio.h>
#include <stdbool.h>
#include <regex.h>bool isIntranet(const char *ip) {// 定义正则表达式的模式和个数const char *patterns[] = {"^10\\.",                     // IPv4 10.x.x.x"^172\\.(1[6-9]|2[0-9]|3[0-1])\\.",  // IPv4 172.16.x.x - 172.31.x.x"^192\\.168\\.",              // IPv4 192.168.x.x"^f[c-d][0-9a-f]{2}:",        // IPv6 fc00::/7"^fe[89ab][0-9a-f]:"          // IPv6 fe80::/10};const int pattern_count = sizeof(patterns) / sizeof(patterns[0]);regex_t regex[pattern_count];bool result = false;// 编译所有正则表达式for (int i = 0; i < pattern_count; i++) {if (regcomp(&regex[i], patterns[i], REG_EXTENDED | REG_ICASE) != 0) {// 编译失败时释放已分配的正则表达式资源for (int j = 0; j < i; j++) regfree(&regex[j]);return false;}}// 匹配所有模式for (int i = 0; i < pattern_count; i++) {if (regexec(&regex[i], ip, 0, NULL, 0) == 0) {result = true;break;}}// 释放正则表达式资源for (int i = 0; i < pattern_count; i++) {regfree(&regex[i]);}return result;
}int main() {printf("%d\n", isIntranet("10.0.0.1"));      // 1 (true)printf("%d\n", isIntranet("fc00::1"));       // 1 (true)printf("%d\n", isIntranet("172.16.0.1"));    // 1 (true)printf("%d\n", isIntranet("192.168.0.1"));   // 1 (true)printf("%d\n", isIntranet("fe80::1"));       // 1 (true)printf("%d\n", isIntranet("8.8.8.8"));       // 0 (false)return 0;
}

• C++

#include <iostream>
#include <regex>
#include <string>bool isIntranet(const std::string& ip) {// 定义 IPv4 内网地址的正则表达式std::regex ipv4Pattern10("^10\\.");std::regex ipv4Pattern172("^172\\.(1[6-9]|2[0-9]|3[0-1])\\.");std::regex ipv4Pattern192("^192\\.168\\.");// 定义 IPv6 内网地址的正则表达式std::regex ipv6PatternFC("^f[c-d][0-9a-f]{2}:", std::regex::icase);std::regex ipv6PatternFE("^fe[89ab][0-9a-f]:", std::regex::icase);// 匹配 IPv4 内网地址if (std::regex_search(ip, ipv4Pattern10)) return true;if (std::regex_search(ip, ipv4Pattern172)) return true;if (std::regex_search(ip, ipv4Pattern192)) return true;// 匹配 IPv6 内网地址if (std::regex_search(ip, ipv6PatternFC)) return true;if (std::regex_search(ip, ipv6PatternFE)) return true;return false;
}int main() {std::cout << isIntranet("10.0.0.1") << std::endl;      // truestd::cout << isIntranet("fc00::1") << std::endl;       // truestd::cout << isIntranet("172.16.0.1") << std::endl;    // truestd::cout << isIntranet("192.168.0.1") << std::endl;   // truestd::cout << isIntranet("fe80::1") << std::endl;       // truestd::cout << isIntranet("8.8.8.8") << std::endl;       // falsereturn 0;
}