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use strict;
use warnings;
...
1234516323493293
12345163234932934567890
12345163234567

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abcdef 5163 1234 5678   =>      5163 1234 5678
1234516323493293        =>      516323493293
12345163234932934567890 =>      516323493293
12345613234567          FAILED  too few digits matched