javascript 正则表达式贪婪模式与非贪婪模式

<code class="language-javascript">/**     
**   author: site120     
**   function : get script part from html document     
**/     
var loadJs = function(str , delayTime)      
{      
    var delayTime = delayTime || 100;      
    var regExp_scriptTag = new RegExp("＜\\s*script([^>]*)>([\\s\\S]*?)＜/\\s*script\\s*>" , "gi");      
    var regExp_scriptAttrib_src = new RegExp("\\s*src?\\s*=\\s*(\"([^\"]+)\"|\'([^\']+)\'|\\s*([^\\s]+)\\s*)" , "gi");      
    var arr_scriptTag = null;      
    var arr_scriptAttib = null;      
    var scriptData = "";      
    var jsList = new Array();      
    while ((arr_scriptTag=regExp_scriptTag.exec(str)) != null)      
    {      
        while ((arr_scriptAttib=regExp_scriptAttrib_src.exec(arr_scriptTag[1])) != null)      
        {       
            if (arr_scriptAttib[3])      
            {      
                jsList.push(arr_scriptAttib[3]);      
            }      
            else if (arr_scriptAttib[2])      
            {      
                jsList.push(arr_scriptAttib[2]);      
            }      
            else     
            {      
                jsList.push(arr_scriptAttib[1]);      
            }      
        }      
        scriptData += (arr_scriptTag[2]);      
    }      
    for (var i=0; i＜jsList.length; i++)      
    {      
        var script = document.createElement("script");      
        script.src = jsList[i];      
        document.body.appendChild(script);      
    }      
    if (scriptData.length > 0)      
    {      
        var fn = "_siteFunction_" + new Date().getTime() + "_" + parseInt(Math.random()*10000) + "_120";      
        scriptData = " var " + fn + " = function(){ " + scriptData + " };  "+fn+"();"     
        window.eval(scriptData);      
    }      
}   </code>

这是用Js来处理正则表达式，原理与Java一样， 
功能是读取一段网页源代码，并将它里面所有的script标签，截取并加载运行。 
这里面的[\s\S]*?利用非贪婪模式来匹配最近script标签之间的所有代码。包括换行