php正則表達式匹配html過濾非法字符

2024-09-04 11:47:36

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匹配一個html標簽，匹配table如下:<table.*?>[ss]*</table> 或 :<table.*?>[ss]*?</table>,以上兩個表達式,一個加了"?"和一個卻不加"?"，那么這有什么區別呢？

我們知道"?"在正則表達式里是一個通配符:匹配前面的子表達式零次或一次,或指明一個非貪婪限定符.

在這里,通過測試,我們得出這樣的結論:在不加"?"的情況下,在匹配下面一段內容的時候:

<table>這是第一個table</table> 我不是table里的內容

<table>這是第二個table</table> 我也不是table里的內容

<table>這是第三個table</table>

<?php

$str=preg_replace("/s+/", " ", $str); //過濾多余回車

$str=preg_replace("/<[ ]+/si","<",$str); //過濾<__("<"號后面帶空格)

$str=preg_replace("//si","",$str); //注釋

$str=preg_replace("/<(!.*?)>/si","",$str); //過濾doctype

$str=preg_replace("/<(/?html.*?)>/si","",$str); //過濾html標簽

$str=preg_replace("/<(/?head.*?)>/si","",$str); //過濾head標簽

$str=preg_replace("/<(/?meta.*?)>/si","",$str); //過濾meta標簽

$str=preg_replace("/<(/?body.*?)>/si","",$str); //過濾body標簽

$str=preg_replace("/<(/?link.*?)>/si","",$str); //過濾link標簽

$str=preg_replace("/<(/?form.*?)>/si","",$str); //過濾form標簽

$str=preg_replace("/cookie/si","cookie",$str); //過濾cookie標簽

$str=preg_replace("/<(applet.*?)>(.*?)<(/applet.*?)>/si","",$str); //過濾applet標簽

$str=preg_replace("/<(/?applet.*?)>/si","",$str); //過濾applet標簽

$str=preg_replace("/<(style.*?)>(.*?)<(/style.*?)>/si","",$str); //過濾style標簽

$str=preg_replace("/<(/?style.*?)>/si","",$str); //過濾style標簽

$str=preg_replace("/<(title.*?)>(.*?)<(/title.*?)>/si","",$str); //過濾title標簽

$str=preg_replace("/<(/?title.*?)>/si","",$str); //過濾title標簽

$str=preg_replace("/<(object.*?)>(.*?)<(/object.*?)>/si","",$str); //過濾object標簽

$str=preg_replace("/<(/?objec.*?)>/si","",$str); //過濾object標簽

$str=preg_replace("/<(noframes.*?)>(.*?)<(/noframes.*?)>/si","",$str); //過濾noframes標簽

$str=preg_replace("/<(/?noframes.*?)>/si","",$str); //過濾noframes標簽

$str=preg_replace("/<(i?frame.*?)>(.*?)<(/i?frame.*?)>/si","",$str); //過濾frame標簽

$str=preg_replace("/<(/?i?frame.*?)>/si","",$str); //過濾frame標簽

$str=preg_replace("/<(script.*?)>(.*?)<(/script.*?)>/si","",$str); //過濾script標簽

$str=preg_replace("/<(/?script.*?)>/si","",$str); //過濾script標簽

$str=preg_replace("//si","javascript",$str); //過濾script標簽

$str=preg_replace("/vbscript/si","vbscript",$str); //過濾script標簽

$str=preg_replace("/on([a-z]+)s*=/si","on/1=",$str); //過濾script標簽

$str=preg_replace("/&#/si","&＃",$str); //過濾script標簽，如javascript：alert('aabb)//開源軟件:Vevb.com

?>