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gi|12345678|ref|NP_001234.1|

$data = gi|12345678|ref|NP_001234.1|;
@data = split ('gi|',$data);
@data1 = split ('|ref',$data[1]);
$number = $data1[0];

$data = gi|12345678|ref|NP_001234.1|;
@data = split ('gi',$data);
@data1 = split ('ref',$data[1]);
$number = $data1[0];

$number =~ m/[0-9]*/;