So, is there a way to use capture groups to match multiple times like separate groups does inthe first example?
Not really (Update: at least within a single regex, LanX already showed /g), unless you mess around with some of the more advanced regex features like maybe (?{})/(??{}). But before going down that route, this feels like an XY Problem to me; for example, for the task you show, unpack may be better, e.g. unpack("(A4)4A*","AAD34017837201D98AAED18778DEF993")
Minor edits.
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