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MAC AddressRegex — Pattern, Examples & Code

^([0-9A-Fa-f]{2}[:\-]){5}[0-9A-Fa-f]{2}$

What it matches / doesn't match

Matches ✅Does not match ❌
●00:1A:2B:3C:4D:5E●00:1A:2B:3C:4D
●AA-BB-CC-DD-EE-FF●001A2B3C4D5E
●de:ad:be:ef:00:01●GG:HH:II:JJ:KK:LL

How it works

Matches 48-bit MAC addresses in the standard six-octet format with either colons or hyphens as separators. Each octet must be exactly two hex digits (0–9, A–F). The separator must be consistent — this pattern allows mixing colons and hyphens, so add a backreference if you need strict consistency.

Code Usage

JavaScript

const regex = /^([0-9A-Fa-f]{2}[:\-]){5}[0-9A-Fa-f]{2}$/;
regex.test("00:1A:2B:3C:4D:5E"); // true

Python

import re
pattern = re.compile(r'^([0-9A-Fa-f]{2}[:\-]){5}[0-9A-Fa-f]{2}$')
bool(pattern.match("00:1A:2B:3C:4D:5E"))  # True

Go

import "regexp"
r := regexp.MustCompile(`^([0-9A-Fa-f]{2}[:\-]){5}[0-9A-Fa-f]{2}$`)
r.MatchString("00:1A:2B:3C:4D:5E") // true

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FAQ

What does the MAC Address regex pattern match?

Matches 48-bit MAC addresses in the standard six-octet format with either colons or hyphens as separators. Each octet must be exactly two hex digits (0–9, A–F). The separator must be consistent — this pattern allows mixing colons and hyphens, so add a backreference if you need strict consistency.

How do I use the MAC Address regex in JavaScript?

const regex = /^([0-9A-Fa-f]{2}[:\-]){5}[0-9A-Fa-f]{2}$/; regex.test("00:1A:2B:3C:4D:5E"); // true

Can I use the MAC Address regex in Python?

Yes. import re pattern = re.compile(r'^([0-9A-Fa-f]{2}[:\-]){5}[0-9A-Fa-f]{2}$') bool(pattern.match("00:1A:2B:3C:4D:5E")) # True