如果用户输入了http://aaa.bbb.ccc
下面这个代码将把他的输入转换成http://aaa.bbb.ccc
大家看看正则表达式有多厉害，呵呵。

<%
'调用这个函数来显示成超联结
Response.Write to_html(s_message)
%>

<%
Function to_html(s_string)
to_html = Replace(s_string, """", """)
to_html = Replace(to_html, "<", "<")
to_html = Replace(to_html, ">", ">")
to_html = Replace(to_html, vbcrlf, "<br>")
to_html = Replace(to_html, "/<", "<")
to_html = Replace(to_html, "/>", ">")
to_html = edit_hrefs(to_html)
End Function
%>

<script language="javascript1.2" runat=server>
function edit_hrefs(s_html){
// 一个使用正则表达式的典范
// 转换文本中所有的超联结和电子邮件格式
s_str = new String(s_html);

s_str = s_str.replace(/\bhttp\:\/\/www(\.[\w+\.\:\/\_]+)/gi,
"http\:\/\/¬¤¸$1");

s_str = s_str.replace(/\b(http\:\/\/\w+\.[\w+\.\:\/\_]+)/gi,
"<a href=\"$1\">$1<\/a>");

s_str = s_str.replace(/\b(www\.[\w+\.\:\/\_]+)/gi,
"<a href=\"http://$1\">$1</a>");

s_str = s_str.replace(/\bhttp\:\/\/¬¤¸(\.[\w+\.\:\/\_]+)/gi,
"<a href=\"http\:\/\/www$1\">http\:\/\/www$1</a>");

s_str = s_str.replace(/\b(\w+@[\w+\.?]*)/gi,
"<a href=\"mailto\:$1\">$1</a>");

return s_str;
}
</script>