[b]bold [b]bddd[/b] [/b]如何用正则匹配

Question

ubb2html？$content = eregi_replace(quotemeta(""),quotemeta("<b>"),$content);
$content = eregi_replace(quotemeta(""),quotemeta("</b>"),$content);

Answer 1

$content = eregi_replace("[“,”<",$content);
$content = eregi_replace("]",">",$content);

Answer 2

$str ='bold [b]bddd [/b]';while(preg_match('/\[b\](.*)\[\/b\]/',$str))
{
 $str = preg_replace('/\[b\](.*)\[\/b\]/','<b>\\1</b>',$str);
}echo $str;

Answer 3

$str=preg_replace("/\[b\](.+?)\[\/b\]/is","<b>$1</b>",$str);

Answer 4

$re  = "#\[b\]((?!\[b).+|(?R))*\[\/b\]#is";
$str = "bold [b]bddd [/b]";
preg_match_all($re, $str, $out);
print_r($out);