实现搜索结果的关键词变色标注的程序(使用正则表达式)

程序|正则

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' 以前写全文检索程序的时候写的.
' 原创 by 飞鸟@dev-club.com
' Email: flybird@dev-club.com
' ie5.5 脚本引擎 required

    dim patern
    dim found
    
    dim str
    dim result
    
    patern="(a)|(b)"
    str=" A dog fall in love with a cat. Can you believe?"
    result=""    
    call getMatchText(str,result,false)
    Response.Write result

    sub getMatchText(byref str,byref result,isNeedTrunc)
        'on error resume next
        Dim regEx, Match, Matches
        dim tStr
        Set regEx = New RegExp         ' 建立正则表达式。        
        regEx.Pattern = (patern)    ' 设置模式。
        regEx.IgnoreCase = True         ' 设置是否区分字符大小写。
        regEx.Global = True         ' 设置全局可用性。
        Set Matches = regEx.Execute(str)   ' 执行搜索。    
        if err.number<>0 then
            response.write "错误1：" & err.description
            err.clear
            exit sub
        end if
        if matches.count <>0 then
            dim startIndex            
            dim myMatchValue
            startIndex=1
            for each match in matches
                if (instr(str,match.value)>0) then
                    if instr(str,match.value)-50 >0 then
                        startIndex=instr(str,match.value)-50
                    else
                        startIndex=1
                    end if
                    myMatchValue=match.value
                    exit for
                end if
            next
            if isNeedTrunc then
                result= (mid(str,startIndex,strLength(myMatchValue)+100))
            else
                result= (str)    
            end if
            for each match in matches
                if not(instr(result,"<font color=re