搜索后的关键字高亮显示（急）100分,该怎么解决_ASP.NET

搜索后的关键字高亮显示（急）100分
一个字符串如:str = "依据季节变化和茶树新梢生长的间歇<a href='#?id=2008'>年份2008</a>平常清明过后春茶开始大"
我现在只想找到非html代码中的2008，并高亮显示，效果如下：
str = "依据季节变化和茶树新梢生长的间歇<a href='#?id=2008'>年份<label class='sr_word01'>2008</label></a>平常清明过后春茶开始大"

如果用 str..Replace("2008","<label class='sr_word01'>2008</label>") 就会把链接地址的参数id=2008中的2008也替换掉了。

如何才能实现？请高手指点

------解决方案--------------------------------------------------------
InnerText;
------解决方案--------------------------------------------------------
用正则表达市啊

------解决方案--------------------------------------------------------
Function ReplaceTest( strPatrn, ItemInfo )
Dim regEx
Dim str
Dim patrnArry
Dim patrn
Dim replStr
Dim nRTCount
Dim nArrayCount

str = ""
patrn = ""
replStr = ""
nArrayCount = 1

patrnArry = split( strPatrn, " " )

For nRTCount = 0 To UBound( patrnArry )
If IsEmptyString( Trim( patrnArry( nRTCount ) ) ) = false Then
replStr = replStr & "$" & nArrayCount & ""
nArrayCount = nArrayCount + 1
End If
Next

For nRTCount = 0 To UBound( patrnArry )
If IsEmptyString( Trim( patrnArry( nRTCount ) ) ) = false Then
patrn = patrn & "(" &Trim( patrnArry( nRTCount ) ) & ")|"
End If
Next

patrn = mid( patrn, 1, len( patrn ) - 1 )

Set regEx = New RegExp
regEx.Pattern = patrn
regEx.IgnoreCase = True
regEx.Global = True
ReplaceTest = regEx.Replace(ItemInfo, replStr)

End Function
------解决方案--------------------------------------------------------

C# code

#region 返回搜索红色关键词　replacered    public static string replacered(string title, string redkey)    {        title = title.Replace(redkey, "<font color='#ff0000'>" + redkey + "</font>");        return title;    }    #endregion
------解决方案--------------------------------------------------------
探讨
引用:
C# code 
#region 返回搜索红色关键词　replacered 
    public static string replacered(string title, string redkey) 
    { 
        title = title.Replace(redkey, " <font color='#ff0000'>" + redkey + " </font>"); 
        return title; 
    } 
    #endregion 


<%# Member.replacered(Eval("aAbout").ToString(),keyword) %> 

------解决方案--------------------------------------------------------
帮顶
------解决方案--------------------------------------------------------
HTML code<html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server">    <title>无标题页</title></head><body>    <form id="form1" runat="server">    <div>    <a href='#?id=2008' id="a1">年份2008</a>    <script>    document.getElementById("a1").innerHTML=document.getElementById("a1").innerHTML.replace("2008","<font color='red'>2008</font>");    </script>    </div>    </form></body></html>
------解决方案--------------------------------------------------------
帮助楼主顶一下，顺便自己也学习一下，o(∩_∩)o...
------解决方案--------------------------------------------------------
学习了....