Hi Valavan,
my $sgml = <<SGML;
<html>
<greeting class="simple">Hello, world!<head>heading</head>
</html>
SGML
while ($sgml=~s#(<)([^/<>\s]+)((?:\s[^/<>]+)?>)([^<>]+)(<[^/<>]+>)#$1$
+2$3$4$1\/$2>$5#){}
print "\n\n";
print "\nOutput:\n$sgml\n";
print "\n\n";
Input:
<html>
<greeting class="simple">Hello, world!<head>heading</head>
</html>
Output:
<html>
<greeting class="simple">Hello, world!</greeting><head>heading</head>
</html>
~
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~
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