GUID regex C#

GUID is an acronym for Globally Unique Identifier and used for resource identification. The term is generally used instead of UUID when working with Microsoft technologies.

GUID regex

Below is a simple regular expression to match a guide in a given string:

new Regex("^(?:\\{{0,1}(?:[0-9a-fA-F]){8}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){12}\\}{0,1})$")

Test it!

/^(?:\{{0,1}(?:[0-9a-fA-F]){8}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){12}\}{0,1})$/

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 GUID
        Regex validateGuidRegex = new Regex("^(?:\\{{0,1}(?:[0-9a-fA-F]){8}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){12}\\}{0,1})$");
        Console.WriteLine(validateGuidRegex.IsMatch("{51d52cf1-83c9-4f02-b117-703ecb728b74}"));  // prints True
        
        // Extract GUID from a string
        Regex extractGuidRegex = new Regex("(?:\\{{0,1}(?:[0-9a-fA-F]){8}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){12}\\}{0,1})");
        string [] extracted = extractGuidRegex.Matches("Resource {51d52cf1-83c9-4f02-b117-703ecb728b74} is down")
            .Cast()
            .Select(m => m.Value) 
            .ToArray(); 
        Console.WriteLine(String.Join(",", extracted)); // prints {51d52cf1-83c9-4f02-b117-703ecb728b74}
    }
}

Test it!

True

False

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Test it!

True

False

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