All those suggestions would use a regex for what you want to get rid of, or for what you want to keep. If you are certain that the length of the prefix you want to get rid of is always the same, try String#substring().
Isaac Ferguson wrote:I think that as it is a json result fro a rest call, I should convert it into a array...
What you have posted appears to be part of a larger JSON document, which looks mal-formed. Right at the beginning, the [ character indicates an array is following, but then there rather than array values, there are key-value pairs, which would normally be part of an JSON object.
Can you post a smaller and complete one to look at?
Changing the beginning array to an object, your data would look like this: