How to determine if a string is a valid v4 UUID? [duplicate]

Answer 1

If you only need it for security (for example if you need to print it in a javascript code and you want to avoid XSS) it doesn't really matter the position of the dashes, so it's just:

 /^[a-z0-9\-]{36}$/i

https://regex101.com/r/MDqB2Z/1