如何利用正则表达式过滤html代码？
http://www.tin.org/bin/man.cgi?section=7&topic=regex
<?//href替换functionAHREF2text($string){returneregi_replace('<A.*HREF=("|')?([^"']*)("|')?.*>([^<]*)</A>','[/4](link:/2)',$string);}$str='Alinkto<ahref="http://www.php.net">PHP.net</A>';$str=AHREF2text($str);//Alinkto[PHP.net](link:http://www.php.net)//url提取$str='Alinkto<ahref="http://www.php.net">PHP.net</A>';$str='Alinkto<ahref="<ahref="http://www.php.net">http://www.php.net</a>">PHP.net</A>';$str=ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]","<ahref="/0">/0</a>",$str);//Alinkto<ahref="<ahref="http://www.php.net">http://www.php.net</a>">PHP.net</A>//汉字截取组合，仍为汉字$str="我们";$str=substr($str,0,1).substr($str,1,1);//空格[:space:]，具体看php.net的POSIXregex$str="abc";$str=ereg_replace("[[:space:]]",'z',$str);//对正则表达式结果的应用，/0~9，0代表整个表达式$str='<FONTcolor=#ff0000>fjl</FONT><IMGsrc="/bx9/bs_edit/adveditor/images/smiley/msn/wink_smile.gif"border=0></FONT>';$str=ereg_replace("<IMG[^<>]*src="([^[:space:]"]*)"[^<>]*>","/1",$str);if(FALSE==strip_tags($str)){returnFALSE;}echohtmlspecialchars($str);?>本文地址：http://www.45fan.com/dnjc/69673.html