用正则表达式过滤html代码

代码例子如下：
<%
option explicit

function striphtml(strhtml)
'strips the html tags from strhtml

 dim objregexp, stroutput
 set objregexp = new regexp

 objregexp.ignorecase = true
 objregexp.global = true
 objregexp.pattern = "<.+?>"

 'replace all html tag matches with the empty string
 stroutput = objregexp.replace(strhtml, "")

 'replace all < and > with < and >
 stroutput = replace(stroutput, "<", "<")
 stroutput = replace(stroutput, ">", ">")

 striphtml = stroutput 'return the value of stroutput

 set objregexp = nothing
end function
%>

<form method="post" id=form1 name=form1>
 <b>enter an html string:</b><br>
 <textarea name="txthtml" cols="50" rows="8" wrap="virtual"><%=request("txthtml")%></textarea>
 <p>
 <input type="submit" value="strip html tags!" id=submit1 name=submit1>
</form>

<% if len(request("txthtml")) > 0 then %>
 <p><hr><p>
 <b><u>view of string <i>with no</i> html stripping:</u></b><br>
 <xmp>
 <%=request("txthtml")%>
 </xmp><p>
 <b><u>view of string <i>with</i> html stripping:</u></b><br>
 <pre>
 <%=striphtml(request("txthtml"))%>
 </pre>
<% end if %>