⍷ — FindX⍷Y marks starting positions where the whole pattern X occurs in Y. The result has Y’s shape. Overlaps count.
'ana'⍷'banana' ⍝ 0x 1x 0x 1x 0x 0x
1 1⍷1 1 1 ⍝ 1x 1x 0x
Works with multidimensional patterns and tolerant element matching.