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sub use_str
{
    my $re = qr/^1\d2\d3\d4\d5\d6\d7\d8\d900$/;
...

    die;
}

Benchmark: timing 5 iterations of use_qr, use_re, use_str...
    use_qr: 33 wallclock secs (33.62 usr +  0.00 sys = 33.62 CPU) @  0
+.15/s (n=5)
    use_re: 18 wallclock secs (17.14 usr +  0.00 sys = 17.14 CPU) @  0
+.29/s (n=5)
...
use_re    3.43     96%     46%      --

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