It's pretty verbose, but it is useful in the sense that you have type-safety between character groups and the control characters. It's neat that it only allows

It's pretty verbose, but it is useful in the sense that you have type-safety between character groups and the control characters. It's neat that it only allows you to create valid Regexes (I hope it does). At least you have static safety that your parenthesis for capture group are properly closed. This advantage is not explained. Not being able to construct invalid regular expressions is a good static safety guarantee that you don't get when you embed DSLs as strings. Edit: This is the same reason why we would prefer jOOQ to embedded String-SQL, if speed/dependencies are of no concern. You're not allowed to construct invalid SQL as the java-type-system gives you these guarantees when using an embedded DSL instead of a String-DSL. This is very powerful, but of course only works if the type system of the host language is powerful enough.