<Regex ignoring matches between square brackets> H...

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Regex ignoring matches between square brackets
Hi I'm trying to create a Regex to help separate a string into a series of object fields, however having issues where the individual field values themselves are lists and therefore comma separated internally.
string = "field11234,field2[[1, 3],[3,4]], field3:[[1, 3],[3,4]]"
I want the regex to identify only the commas before "field2" and "field3", ignoring the ones separating the list values (e.g. 1 and 3, ] and [, 3 and 4.
I've tried using non-capturing groups to ignore the character after...