regular expression question

G

Guest

in the following regular express
$_="BCADeFGHIJKL";
if (/\L[\w]\E/) { print "true"} else { print "false\n" };
if (/\U[\w]\E/) { print "true"} else { print "false\n" };

why the first one print true while the second one print false?
Can someone explain \L \U?
 

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