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GUID regex PHP

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.

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GUID regex

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

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

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Example code in PHP:

// Validate GUID
$guid_regex = "/^(?:\\{{0,1}(?:[0-9a-fA-F]){8}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){4}-(?:[0-9a-fA-F]){12}\\}{0,1})$/"; 
echo preg_match($guid_regex, '51d52cf1-83c9-4f02-b117-703ecb728b74'); // returns 1
echo preg_match($guid_regex, '{51d52cf1-83c9-4f02-b117-703ecb728b74}'); // returns 1
echo preg_match($guid_regex, '{51d52cf1-83c9-4f02-b117-703ecb728-b74}'); // returns 0

// Extract GUID from a string
$extract_guid_pattern = "/(?:\\{{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})/";
$string_to_match = 'Resource {51d52cf1-83c9-4f02-b117-703ecb728b74} is down';
preg_match_all($extract_guid_pattern, $string_to_match, $matches);
print_r($matches[0])// matches[0] is ['{51d52cf1-83c9-4f02-b117-703ecb728b74}']
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