<script type=\"text/javascript\" src=\"http://z.com/a.js\"></script>
<!--[if IE 6]><script type=\"text/javascript\" src=\"http://z.com/pngfix.js\"></script><![endif]-->
<script src=\"http://z.com/jquery.uploadify.3.2.1.js\"></script>
<script>
//true56546456
function showTips(type,msg,d){//true存在文件,false不存在文件
$('#'+type).parent().find('span').text(msg).removeClass('Validform_right').addClass('Validform_wrong');
}
//trueddddddddd
var uploadFile=false,//true存在文件,false不存在文件
dia,upToken='roS2qYSKuPqZB7rZmvfpZy';
//true存在文件,false不存在文件
</script>
<span style=\"display:None;\"><script type=\"text/javascript\">
var _bdhmProtocol = ((\"https:\" == document.location.protocol) ? \" https://\" : \" http://\");
document.write(unescape(\"%3Cscript src='\" + _bdhmProtocol + \"hm.baidu.com/h.js?28' type='text/javascript'%3E%3C/script%3E\"));
</script></span>
2222222222222
";
我弄了一个，不正确
$str=preg_replace('/(<script>[\s\S]*?)[^(http:|https:)]\/\/.*?\n([\S\s]*?<\/script>)/si','$1$2',$str);
echo $str;
------解决思路----------------------
$s =<<< TXT
<script> document.write(unescape(\"%3Cspan id='szgs_stat_icon_2'%3E%3C/span%3E%3Cscript src='http://www.szgswljg.gov.cn/sendMark?siteid=2&website=z.com' type='text/javascript'%3E%3C/script%3E\")); </script>
<script type=\"text/javascript\" src=\"http://z.com/a.js\"></script>
<!--[if IE 6]><script type=\"text/javascript\" src=\"http://z.com/pngfix.js\"></script><![endif]-->
<script src=\"http://z.com/jquery.uploadify.3.2.1.js\"></script>
<script>
//true56546456
function showTips(type,msg,d){//true存在文件,false不存在文件
$('#'+type).parent().find('span').text(msg).removeClass('Validform_right').addClass('Validform_wrong');
}
//trueddddddddd
var uploadFile=false,//true存在文件,false不存在文件
dia,upToken='roS2qYSKuPqZB7rZmvfpZy';
//true存在文件,false不存在文件
</script>
<span style=\"display:None;\"><script type=\"text/javascript\">
var _bdhmProtocol = ((\"https:\" == document.location.protocol) ? \" https://\" : \" http://\");
document.write(unescape(\"%3Cscript src='\" + _bdhmProtocol + \"hm.baidu.com/h.js?28' type='text/javascript'%3E%3C/script%3E\"));
</script></span>
2222222222222
TXT;
echo preg_replace('#([^:])//.+#m', '$1', $s);
<script> document.write(unescape(\"%3Cspan id='szgs_stat_icon_2'%3E%3C/span%3E%3Cscript src='http://www.szgswljg.gov.cn/sendMark?siteid=2&website=z.com' type='text/javascript'%3E%3C/script%3E\")); </script>
<script type=\"text/javascript\" src=\"http://z.com/a.js\"></script>
<!--[if IE 6]><script type=\"text/javascript\" src=\"http://z.com/pngfix.js\"></script><![endif]-->
<script src=\"http://z.com/jquery.uploadify.3.2.1.js\"></script>
<script>
function showTips(type,msg,d){
$('#'+type).parent().find('span').text(msg).removeClass('Validform_right').addClass('Validform_wrong');
}
var uploadFile=false,
dia,upToken='roS2qYSKuPqZB7rZmvfpZy';
</script>
<span style=\"display:None;\"><script type=\"text/javascript\">
var _bdhmProtocol = ((\"https:\" == document.location.protocol) ? \" https://\" : \" http://\");
document.write(unescape(\"%3Cscript src='\" + _bdhmProtocol + \"hm.baidu.com/h.js?28' type='text/javascript'%3E%3C/script%3E\"));
</script></span>
2222222222222