def unescapeHTML(string)
str = string.dup
str.gsub!(/&(.*?);/n) {
match = $1.dup
case match
when /\Aamp\z/ni then '&'
when /\Aquot\z/ni then '"'
when /\Agt\z/ni then '>'
when /\Alt\z/ni then '<'
when /\A#(\d+)\z/n then Integer($1).chr
when /\A#x([09af]+)\z/ni then $1.hex.chr
end
}
str
end
puts unescapeHTML("1<2 && 4>3")
puts unescapeHTML(""A" = A = A")
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