3 ms·
(.)+\1 means the last letter has to be equal to the first letter. (AB|O|OR)+ dictates that the last letter of the first row has to be A or O [^ABRC]+ makes it
by cyborgx7 12y ago
(.)+\1 means the last letter has to be equal to the first letter.
(AB|O|OR)+ dictates that the last letter of the first row has to be A or O
[^ABRC]+ makes it so that the lower right square can't be B therefore the upper right square can't be A