C# Simple Regex - 32 characters, containing only 0-9 and a-f (GUID)

Question

How to test using regex in C# if:

• length of string is exactly 32
• string contains only numbers from 0-9 and small letters from a-f

Answer 1

How about:

Regex regex = new Regex("^[0-9a-f]{32}$");
if (regex.IsMatch(text))
...

Answer 2

In .Net 4.0 there is Guid structure that has TryParse static function.
http://msdn.microsoft.com/en-us/library/system.guid.aspx

Answer 3

If you're not dead-set on using a Regex for this purpose, this is pretty clean:

Func<char, bool> charValid = c => (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f');
bool isValid = text.Length == 32 && text.All(charValid);