⍝ Vector substitution:

    ⎕io←1

    dots←' ·'∘subs                              ⍝ Composition

    dots 2 12⍴'Many a time and oft.    '        ⍝ Single char substitution
Many·a·time·
and·oft.····

    (6 7)(666 777)subs 2 3 4⍴⍳12                ⍝ High rank argument
1   2   3  4
5 666 777  8
9  10  11 12
            
1   2   3  4
5 666 777  8
9  10  11 12

    (7 8 9) 'repl' subs 3 5⍴⍳15                 ⍝ Replace with longer string
 1  2  3  4  5  0
 6  r  e  p  l 10
11 12 13 14 15  0

    (7 8 9) 'r' subs 3 5⍴⍳15                    ⍝ Replace with shorter string
 1  2  3  4  5
 6  r 10  0  0
11 12 13 14 15
                                                ⍝ Multiple substitutions:

    ↑subs/('Mr' 'Mrs')('his' 'her')'Mr Green and his daughter, Theresa.'
Mrs Green and her daughter, Theresa.

    ⍕(3,¨2 3 4)('peek' 'a' 'boo') subs ⍳5 5     ⍝ Nested substitution
 1 1  1 2   1 3  1 4  1 5 
 2 1  2 2   2 3  2 4  2 5 
 3 1  peek  a    boo  3 5 
 4 1  4 2   4 3  4 4  4 5 
 5 1  5 2   5 3  5 4  5 5 

    (1 1)(2 3)subs 0 1 1 1 0                    ⍝ Overlapping strings
0 2 3 2 3 0

⍝∇ subs

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