#!/usr/bin/perl 


@val = (
"aBaBaBBaa: aBaBaB: aBaBaB",
"    message-ad  :  ",
"Message-Id blabla",
"   aaaa : aaaaa BBBB",
"   aaaa : aaa:aa BBBB",
"",
);


foreach  $val (@val)  {
	$val = $val;
	print  "[$val]", "\n";
	$val =~ s/^\s*(.+?):(.+)$/\U$1\E:$2/;
	print "[$val]", "\n\n";
}