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/(?:^.{0,4}|[^e].{4}|[^c].{3}|[^h].{2}|[^o].|[^ ])done/is
/(.....)done(??{$1 eq "echo " ? "(*FAIL)" : ""})|^.{0,4}done/is # Repl
+ace (*FAIL) with (?!) pre-5.10

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```
!/echo done$/i && /done$/i
```