Networkingflags: g

IPv6 Address

Match full (non-compressed) IPv6 addresses written as eight colon-separated hextets.

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}", "g");
const input = "2001:0db8:85a3:0000:0000:8a2e:0370:7334";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

Python (re) code

pyPython

import re

pattern = re.compile(r"(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}")
input_text = "2001:0db8:85a3:0000:0000:8a2e:0370:7334"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

Go (RE2) code

goGo

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}`)
	input := `2001:0db8:85a3:0000:0000:8a2e:0370:7334`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

Pattern

regexengine-agnostic

(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}   (flags: g)

Raw source: (?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}

How it works

Seven groups of 1–4 hex digits each followed by a colon, then a final hextet. Does not cover :: shorthand or IPv4-mapped addresses — use a more complex pattern if you need those forms.