Regular Expressions 101

Explanation
Pro

This pattern has errors, review the details below or .

? Quantifier cannot follow an opening parenthesis

Ready to run

26 tokens

^({)?(?(1)|(\()?)[0-9A-F]{8}(-)?([0-9A-F]{4}(?(3)-)){3}[0-9A-F]{12}(?(1)}|(?(2)\)))$