Delete N lines after cursor that contain a specific pattern

Question

It is possible to delete all lines matching a pattern using  :g/pattern/d.
Using the following command, you can replace words matching a pattern, 20 lines after where the cursor currently is: :s/pattern/changed_pattern/g20
How do you delete all lines matching a pattern, but N lines after where the cursor currently is ?
I've tried : 34,50/pattern/d however it delete backward, and inconsistently. Beside, it requires you to know exactly the lines between which to apply the deletion.

gradzikb · Answer

These commands should do the trick
:global/pattern/.+1,.+Ndelete
:global/pattern//+1,/+Ndelete

The key is to understand [range] for delete command.

.+1 one line after cursor line
.+N N lines after cursor line
/+1 one line after current match
/+N N lines after current match

See :help cmdline-ranges for more details.
Be aware it will delete pattern if it is in N lines range!

Delete N lines after cursor that contain a specific pattern

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