UUID regex

What the uuid regex accepts and rejects

Each result below is the output of the pattern itself, run on the input when this page was built — not a claim copied next to it. A wrong verdict stops the build.

Limits

• The nil UUID (all zeros) and the max UUID (all f) are valid values in RFC 9562 but carry no version, so they are refused. Accept them explicitly if your data uses them as sentinels.
• Braced and hyphen-less forms are refused. Strip braces and normalise the case before storing, rather than widening the pattern.

Try it on your own input

Open this pattern in the regex tester with every example above on its own line. The link adds the g and m flags so that ^ and $ hold per line and every line is tested: the highlighted lines are the ones marked as passing here. Paste your own data in place of the examples — it is matched in your browser and never uploaded.

Other common regexes

• Email address
• URL
• IPv4 address
• Hex color
• ISO 8601 date
• 24-hour time
• Semantic version
• URL slug
• Phone number (E.164)
• US ZIP code
• MAC address

Or open the regex tester empty and bring your own pattern.