Validating UUIDs with Regular Expressions in Java

Universally Unique Identifier (UUID) or UUIDs are a great way of providing practical randomness, for instance for tracking IDs or generated database keys.

I've worked with them a fair bit, and each time I end up working with them, I find myself needing to Google for the regular expression that works for Java.

In the spirit of blogumentation, I thought I'd document it for future me:

/**
 * Regular expression, in {@link String} form, to match a Universally Unique Identifier (UUID), in
 * a case-insensitive fashion.
 */
public static final String UUID_STRING =
    "[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}";
/**
 * Regular expression to match any Universally Unique Identifier (UUID), in a case-insensitive
 * fashion.
 */
public static final Pattern UUID = Pattern.compile(UUID_STRING);
/**
 * Regular expression, in {@link String} form, to match a Version 4 Universally Unique Identifier
 * (UUID), in a case-insensitive fashion.
 */
public static final String UUID_V4_STRING =
    "[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-4[a-fA-F0-9]{3}-[89abAB][a-fA-F0-9]{3}-[a-fA-F0-9]{12}";
/**
 * Regular expression to match a Version 4 Universally Unique Identifier (UUID), in a
 * case-insensitive fashion.
 */
public static final Pattern UUID_V4 = Pattern.compile(UUID_V4_STRING);

These are an extract from the Apache-2.0 licensed java library uuid.

Written by Jamie Tanna's profile image Jamie Tanna on , and last updated on .

Content for this article is shared under the terms of the Creative Commons Attribution Non Commercial Share Alike 4.0 International, and code is shared under the Apache License 2.0.

#blogumentation #java #uuid #regex.

This post was filed under articles.

Related Posts

Other posts you may be interested in:

Interactions with this post

Interactions with this post

Below you can find the interactions that this page has had using WebMention.

Have you written a response to this post? Let me know the URL:

Do you not have a website set up with WebMention capabilities? You can use Comment Parade.