👀 Views: 33 💬 Answers: 1 📅 Created: 2025-06-19

regex node.js ipv6 JavaScript

I've looked through the documentation and I'm still confused about I've spent hours debugging this and I'm trying to validate IPv6 addresses using a regex pattern in my Node.js application, but I'm working with issues where valid addresses are failing to match... Specifically, I'm using the following regex pattern: ```javascript const ipv6Pattern = /^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$|^(?:[0-9a-fA-F]{1,4}:){1,7}:$|^(?:[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}:){1,4}(?::[0-9a-fA-F]{1,4}){1,3}$|^(?:[0-9a-fA-F]{1,4}:){1,3}(?::[0-9a-fA-F]{1,4}){1,4}$|^(?:[0-9a-fA-F]{1,4}:){1,2}(?::[0-9a-fA-F]{1,4}){1,5}$|^[0-9a-fA-F]{1,4}:(?::[0-9a-fA-F]{1,4}){1,6}$|^:(?::[0-9a-fA-F]{1,4}){1,7}$|^(?:[0-9a-fA-F]{1,4}:){1,6}:(?:[0-9a-fA-F]{1,4}:){0,1}[0-9a-fA-F]{1,4}$|^(?:[0-9a-fA-F]{1,4}:){0,1}:(?:[0-9a-fA-F]{1,4}:){1,6}$|^(?:[0-9a-fA-F]{1,4}:){0,1}:(?:[0-9a-fA-F]{1,4}){1,7}$/; ``` I expected this pattern to match valid IPv6 addresses like `2001:0db8:85a3:0000:0000:8a2e:0370:7334`, but it doesn't seem to work as intended. I tested it with the following code: ```javascript const testIPs = [ '2001:0db8:85a3:0000:0000:8a2e:0370:7334', '::1', '2001:db8::2:1', 'invalid:ip:address' ]; testIPs.forEach(ip => { const isValid = ipv6Pattern.test(ip); console.log(`Testing ${ip}: ${isValid}`); }); ``` When I run this code, I get the following output: ``` Testing 2001:0db8:85a3:0000:0000:8a2e:0370:7334: false Testing ::1: false Testing 2001:db8::2:1: false Testing invalid:ip:address: false ``` It seems like every test case returns `false`, which is quite frustrating. I've double-checked the regex pattern and even tried simplifying it, but I need to pinpoint the scenario. I'm currently using Node.js v16.13.0. Is there a better way to handle this or a more reliable regex pattern for matching IPv6 addresses? Any insight would be greatly appreciated! Any ideas what could be causing this? I'm using Javascript latest in this project. What would be the recommended way to handle this? For context: I'm using Javascript on Windows 10. What am I doing wrong?