Regex to get a guid from a email reply

Question

Trying to figure out the Regex pattern to match if an email contains a Guid, e.g.

[email protected]

The Guid could potentially be anywhere before the @, e.g.

[email protected]

Answer 1

I use this to find Guids

Regex isGuid = 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}$", RegexOptions.Compiled);

Answer 2

A lazy variant would be

([0-9a-f-]{36}).*?@

It is easy to read and I bet it matches 99,99% of all cases ;) But then in 0,00001% of all cases sombody could have an email address that fits in a GUID scheme.