So let's go for another one: 
$_="OBX|NM|aaA..^Haem^RD2|7.5|g/dL|13.0-18.0|OR|";s#^(OBX\|[^|]+\|)([^
+^]*)#$1 . join("",map( { my $x=$_; y/A-Z/U/ || y/a-z/L/; "$_$x" } spl
+it //,$2)) #e

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Update: 2 downvotes? Would be nice to know why. 
s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%.+=%;.#_}\&"^"-+%*)
+.}%:##%}={~=~:.")&e&&s""`$''`"e

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In reply to Re^3: Can anyone make this regex job neater? by Skeeve
in thread Can anyone make this regex job neater? by Melly

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