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mbomb007
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#05AB1E, length 22

This is probably too easy.

Regex (PCRE)

^([E-Z0]*[ˆ>*}<]){7}$ 

Output

[[1, 2, 3, 4], [8, 7, 6, 5], [9, 10, 11, 12], [16, 15, 14, 13]] 
mbomb007
  • 23.6k
  • 7
  • 66
  • 143