2 ms·
Speaking of that puzzle how come [COBRA]+ and (.)+\1 give back result 'O'? Why not C or B or A?
by Ygg2 12y ago
Speaking of that puzzle how come [COBRA]+ and (.)+\1 give back result 'O'? Why not C or B or A?
- 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