Some sample code with "this is what I get", and "this is what I want" would help understand where you are having a problem. The following should be a good starting point, if not the stimulus for a D'oh moment :).
use strict;
use warnings;
my $lines = do {local $/; <DATA>};
my ($line3) = $lines =~ /Line 3 : (.*?)\n/;
print ">$line3<";
__DATA__
Line 1 : Dit is de eerste regel
Line 2 : Dit is de tweede regel
Line 3 : Dit is de derde regel
Line 4 : Dit is de vierde regel
Prints:
>Dit is de derde regel<
DWIM is Perl's answer to Gödel
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