list manipulation - Parsing string with nested information

I am trying to parse a string, but I have no idea how to solve the following problem

problem = "a { b { c d } e } aa { bb cc }";
answer = {{"a", "b", "c"}, {"a", "b", "d"}, {"a", "e"}, {"aa", "bb"}, {"aa", "cc"}};

So the answer is a path in each sub-list of the list

Any suggestions ?

Answer

I may have misunderstood the requirement but this seems to work for the example at least:

problem = "a { b { c d } e } aa { bb cc }";


Map[Flatten, StringSplit[problem] //. 
 {head___, x_, "{", Shortest[y__], "}", tail___} :> 
 {head, Sequence @@ Thread[{x, {y}}], tail}]

(* {{"a", "b", "c"}, {"a", "b", "d"}, {"a", "e"}, {"aa", "bb"}, {"aa", "cc"}} *)

Comments

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