my @test = (
    "text text text 1 text",
    "1 text text text 2 text 3 ",
    "text 1 text text 2 text",
    "text text text 1 text 2 3.0",
    "1 2 3 4 5 6 7 8 9 10 11",
    "text text text text"
);

my @filtered = map {/(\d+)(?:\.0*)?\D*$/; $1} @test;

print join "\n", @filtered;