Use a non-greedy match:
my ($thirdline) = $contents =~ m/Line3 : (.*?)\n/s;
Line1 : Dit is de eerste regel
Line2 : Dit is de tweede regel
Line3 : Dit is de derde regel
Line4 : Dit is de vierde regel
Dit is de derde regel
Or you could match against a negated character class:
my ($thirdline) = $contents =~ m/Line3 : ([^\n]+)/s;
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