Go (RE2)

IPv6 Address in GO

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

Try it in the GO tester →

Pattern

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

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.

How the pattern 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.

Examples

Input

2001:0db8:85a3:0000:0000:8a2e:0370:7334

Matches

  • 2001:0db8:85a3:0000:0000:8a2e:0370:7334

Input

::1

No match

—

Same pattern, other engines

JavaScript / ECMAScript

Supported

See how this pattern looks (and behaves) in JavaScript's built-in RegExp.

Python (re)

Supported

See how this pattern looks (and behaves) in Python's stdlib `re` module.

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