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UUID regex Java
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UUID regex Java

UUID

UUID is a 128-bit label used for identifications in computer systems.

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UUID regex

Below is a simple UUID regular expression that will work most of the time:

Pattern.compile("^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$")

Test it!
/^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$/i

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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 UUID
        boolean isMatch = Pattern.compile("^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$")
               .matcher("123e4567-e89b-12d3-a456-426614174000")
               .find(); 
        System.out.println(isMatch); // prints true
        
        // Extract UUID from a string
        String[] matches = Pattern.compile("[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}")
                          .matcher("The UUID 123e4567-e89b-12d3-a456-426614174000 for node Node 01 is not unique.")
                          .results()
                          .map(MatchResult::group)
                          .toArray(String[]::new);
        System.out.println(Arrays.toString(matches)); // prints [123e4567-e89b-12d3-a456-426614174000]
    }
}

Test it!

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Test it!

True

False

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