I have this kind of strings:  {test1|test2|test3} This is easy to match with something like:  ~{(.*?)}~  But I would like to be able to match strings like: {test1|test2|test3{subtest1|subtest2}} or {test1|test2|test3{subtest1|subtest2{subsubtest1|subsubtest2|subsubtest3}}} I can't figure out how I could match that in the ...