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$ perl -E '
    my $re = qr{(\w+)((?:\s*\d+\s*)*)};
...
'
|a 1 2 3 |: |a| | 1 2 3 |
|b 4 5 6|: |b| | 4 5 6|

$ perl -E '
    my $re = qr{(\w+)\s+((?:\s*\d+)*)};
...
'
|a 1 2 3|: |a| |1 2 3|
|b 4 5 6|: |b| |4 5 6|