If your paragraphs go from "blabla" to "blabla", a trick would be to set your input record separator to return records that end with "blabla", instead of the usual newline "\n". Perhaps something like:
use warnings;
use strict;

...

local $/ = "blabla";

while (<DATA>) {
    s/TEXT TO BE REMOVED// unless m/^5/;
    print;
    ...
}

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In reply to Re^4: Substitute in a subparagraph by repellent
in thread Substitute in a subparagraph by guyov1

Title:
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