http://www.tin.org/bin/man.cgi?section=7&topic=regex
<?//href替换function AHREF2text($string) { return eregi_replace('<A .*HREF=("|')?([^ "']*)("|')?.*>([^<]*)</A>', '[\4] (link: \2)', $string);}$str = 'A link to <a href="http://www.php.net">PHP.net</A>';$str = AHREF2text($str);//A link to [PHP.net] (link: http://www.php.net)//url提取$str = 'A link to <a href="http://www.php.net">PHP.net</A>';$str = 'A link to <a href="<a href="http://www.php.net">http://www.php.net</a>">PHP.net</A>';$str = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]", "<a href="\0">\0</a>", $str);//A link to <a href="<a href="http://www.php.net">http://www.php.net</a>">PHP.net</A>//汉字截取组合，仍为汉字$str = "我们";$str = substr($str, 0, 1).substr($str, 1, 1);//空格[:space:]，具体看php.net的POSIX regex$str = "a b c";$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 = '<FONT color=#ff0000>fjl</FONT><IMG src="/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) ){ return FALSE;}echo htmlspecialchars($str);?>
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