x  x  x  x
 1  2  3  4
(.) \1 \1
   (.) \1 \1

[download]
 x  x  x  x  x  x
 1  2  3  4  5  6
(.) \1 \1          #r1
   (.) \1 \1       #r2
      (.) \1 \1    #r3 
         (.) \1 \1 #r4

[download]

6 length - 3 consecutive = 3 leading

...(.)\1\1
..(.)\1\1.
.(.)\1\1..
(.)\1\1...
(.)\1\1(.)\1\1

[download]

So m{(.)\1\1(.)\1\1 |(.)\1\1... |.(.)\1\1.. |..(.)\1\1. |...(.)\1\1 }x

In reply to Re: Regex matching on grid alignment by Anonymous Monk
in thread Regex matching on grid alignment by Anonymous Monk

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