IP Address Regex

IP Address Regex

Test and validate IP address patterns for IPv4 and IPv6 formats. Ensure valid ranges (0-255) and proper formatting.

IPv4 Patterns

``javascript // Simple IPv4 (doesn't validate range) const simpleIPv4 = /^\d{1,3}(?:\.\d{1,3}){3}$/;

// Strict IPv4 (validates 0-255) const strictIPv4 = /^(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)$/;

// Test strictIPv4.test('192.168.1.1'); // true strictIPv4.test('255.255.255.255'); // true strictIPv4.test('256.1.1.1'); // false (256 > 255) strictIPv4.test('1.2.3'); // false (missing octet) `

IPv4 Range Breakdown

IPv6 Patterns

`javascript // Simple IPv6 (8 groups of 4 hex digits) const simpleIPv6 = /^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$/;

// IPv6 with zero compression (::) const ipv6WithCompression = /^(?:(?:[0-9a-fA-F]{1,4}:){1,7}:|(?:[0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|(?:[0-9a-fA-F]{1,4}:){1,5}(?::[0-9a-fA-F]{1,4}){1,2}|::(?:[0-9a-fA-F]{1,4}:){0,5}[0-9a-fA-F]{1,4}|::|(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4})$/i;

// Test simpleIPv6.test('2001:0db8:85a3:0000:0000:8a2e:0370:7334'); // true ipv6WithCompression.test('::1'); // true (localhost) ipv6WithCompression.test('2001:db8::1'); // true (compressed) `

IP Address Validator

`javascript function validateIP(ip) { // IPv4 strict pattern const ipv4 = /^(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)$/;

// IPv6 full pattern const ipv6 = /^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$|^::(?:[0-9a-fA-F]{1,4}:){0,6}[0-9a-fA-F]{1,4}$|^(?:[0-9a-fA-F]{1,4}:){1,6}:$|^(?:[0-9a-fA-F]{1,4}:){1,5}:[0-9a-fA-F]{1,4}$/i;

if (ipv4.test(ip)) return { valid: true, version: 4 }; if (ipv6.test(ip)) return { valid: true, version: 6 }; return { valid: false, version: null }; }

validateIP('192.168.1.1'); // { valid: true, version: 4 } validateIP('::1'); // { valid: true, version: 6 } validateIP('invalid'); // { valid: false, version: null } ``

Special IP Addresses