Regular Expressions 101

All the errors detected are listed below, from left to right, as they appear in the pattern.

? Quantifier cannot follow an opening parenthesis

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Regular Expression

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