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  DB<139> p
0123456789abcdefghijklmnopqrstuvwxyz
...
7  'stuv'
8  'wxyz'
  DB<140>

  DB<140> x m{ (?<! (?: .... ){4} ) .... }xg
0  0123
...
2  '89ab'
3  'cdef'
  DB<141>

  DB<142> x m{ (?<! (?: .... ){4} ) .... | .+ }xg
0  0123
...
3  'cdef'
4  'ghijklmnopqrstuvwxyz'
  DB<143>