Ruud,
Consider warnings and quotemeta:
|perl -i -pwe 'next if /^\Q$ENV{DELETE}/' path/to/your/file
If this requires learning what those are, perhaps it's better to stick
with what I know than to get in over my head:
| (echo g/$stringoftheday/d ; echo x) | ex -s $file
So there's a shell; so sue me.
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