RegEx library
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Mac address regex C#
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Mac address regex C#

Mac address is a unique identifier assigned to network interface controllers like WiFi routers, Ethernet controllers, etc. It has a format of six groups of 2 hexadecimal digits separated by dash or colon (e.g. 00:00:5e:00:53:af). Mac address regular expression can be used to validate that a certain string contains mac address or extract mac address from a given string.

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Simple Mac address regex (IEEE 802)

Below is a simple mac address regex that supports dashes or colons as separators:

Pattern.compile("^(?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2})$")
Test it!
/^(?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2})$/

True

False

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Example code in C#:

using System.Text.RegularExpressions;
using System.Linq;
using System;
                    
public class Program
{
    public static void Main()
    {
        // Validate mac address
        Regex validateMacAddressRegex = new Regex("^(?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2})$");
        Console.WriteLine(validateMacAddressRegex.IsMatch("00:00:5e:00:53:af"));  // prints True
        
        // Extract mac addresses from a string
        Regex extractMacAddressRegex = new Regex("(?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2})");
        string [] extracted = extractMacAddressRegex.Matches("Unknown error in node 00:00:5e:00:53:af. Terminating.")
            .Cast()
            .Select(m => m.Value) 
            .ToArray(); 
        Console.WriteLine(String.Join(",", extracted)); // prints 00:00:5e:00:53:af
    }
}
Test it!

True

False

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Test it!

True

False

Enter a text in the input above to see the result