Use sprintf '%04d':

$whole_number = '0001.0000.0000.0010';
$whole_number =~ s/(?<=\.)(\d+)$/sprintf('%04d', $1+1)/e;
print($whole_number, "\n");  # 0001.0000.0000.0011

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In reply to Re: increment # but keep # of digits same by ikegami
in thread increment # but keep # of digits same by yankeeblue

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