Assuming 0 indexing: row 0 column 4. Constrained by rows 0, 2, 3 where rows 0 and 2 have [^XZVCHFJLQM] and [^\sPQFB] and row 3 has [OYSRU]. All of: O, Y, S, R and U match. Am I missing something?
[^PZVJG]{4}(.)[EFUG]{6}(.)[^\sPZVJI]{2}
should be
[^PZVJG]{4}(.)[EFUG]{6}\1[^\sPZVJI]{2}
(note the \1 )