Mac address regex Java
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.
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})$")
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Example code in Java:
import java.util.regex.Pattern;
import java.util.regex.MatchResult;
import java.util.Arrays;
public class Main {
public static void main(String []args) {
// Validate mac address
boolean isMatch = Pattern.compile("^(?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2})$")
.matcher("00:00:5e:00:53:af")
.find();
System.out.println(isMatch); // prints true
// Extract mac address from a string
String[] matches = Pattern.compile("(?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2})")
.matcher("Unknown error in node 00:00:5e:00:53:af. Terminating.")
.results()
.map(MatchResult::group)
.toArray(String[]::new);
System.out.println(Arrays.toString(matches)); // prints [00:00:5e:00:53:af]
}
}
