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(/<script[^<]+<\/script>/img).test(content)
<html>
<head>
<script>
function lilactext(htmlStr){
var regx=/<script\s[^<]+\.sina\.cn\/js\/service\.js[^<]+<\/script>/;
var str=htmlStr.replace(regx,"~~~没~~");
alert(str);
}
</script>
</head>
<form name="myForm">
<textarea id="lilacinput" style="width:300px;height:300px;">
<script type="text/javascript" src="http://*.sina.cn/js/service.js" >
</script>
</textarea>
<input type="button" value="submit" onclick="lilactext(document.getElementById('lilacinput').value)"/>
</form>
</html>
<html>
<head>
<script>
function lilactext(htmlStr){
var regx=/<script\s[^<]*<\/script>/;
var str=htmlStr.replace(regx,"~~~没~~");
alert(str);
}
</script>
</head>
<form name="myForm">
<textarea id="lilacinput" style="width:300px;height:300px;">
<script type="text/javascript" src="http://*.sina.cn/js/service.js" >
</script>
</textarea>
<input type="button" value="submit" onclick="lilactext(document.getElementById('lilacinput').value)"/>
</form>
</html>
if(/<script[^\.]+\.sina\.cn\/js\/service\.js[^<]+<\/script>/img.test(content))
alert("含此内容");
else
alert("不含此内容");