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NTE||L|obr note OBX|NM|aaA..^Haem^RD2|7.5|g/dL|13.0-18.0|OR| NTE||L|obx note 1/1 for 3058 OBX|NM|dBf..^TWC^RD2|8.9|10*9/L|4.0-11.0||
if(m/(^OBX\|)([^\|]*\|){2}([^\^]*)(.*$)/){ my $pre = $1 . $2; ... $read =~ s/[a-z]/L$&/g; $_ = $pre . $read . $post; }