把一段html中 含用<script>.....</script> 替换成 <script>......</script>.
有时<script type="text/javascript">是这样子的。<script type="text/javascript" >......</script>.
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yourhtml=Regex.Replace(yourhtml,@"(?i)<scrip(t[^>]*?)>([^<>]*)</script>","<script$1>$2</script>");