Networkingflags: g

MAC Address

Match 48-bit MAC addresses written with colon or hyphen separators (e.g. 00:1A:2B:3C:4D:5E).

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("(?:[0-9A-Fa-f]{2}[:\\-]){5}[0-9A-Fa-f]{2}", "g");
const input = "00:1A:2B:3C:4D:5E";
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]{2}[:\-]){5}[0-9A-Fa-f]{2}")
input_text = "00:1A:2B:3C:4D:5E"
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]{2}[:\-]){5}[0-9A-Fa-f]{2}`)
	input := `00:1A:2B:3C:4D:5E`
	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]{2}[:\-]){5}[0-9A-Fa-f]{2}   (flags: g)

Raw source: (?:[0-9A-Fa-f]{2}[:\-]){5}[0-9A-Fa-f]{2}

How it works

Five pairs of hex digits each followed by : or -, then a final hex pair. Case-insensitive by character class to handle both upper and lower hex digits.