从帖子文本中删除 bbcode 大小

Question

请原谅我不擅长正则表达式。

抱歉：示例已更新

我正在使用 PHP 脚本清理 phpBB 论坛中的一些垃圾。 phpBB 使用某种密钥对 bbcode 进行编码，即出现在冒号后的 8 位字符串。这是一个例子：

outer [size=5:24f81ld3]inner text[/size:24f81ld3] outer

我试图去掉大小是一个字符而不是两个字符的地方，所以上面会变成：

outer inner text outer

但是这个：

outer [size=100:24f81ld3]inner text[/size:24f81ld3] outer

不会变成这样：

outer inner text outer

感谢任何帮助！

Answer 1

这是代码

function remove_phpbb_garbage($str)
{
  return preg_replace('/\[size=[0-9a-z](?::[0-9a-z]+)?\]((?:[^\[]|\[(?!\/size))*)\[\/size(?::[0-9a-z]+)?\]/i', '\1', $str);
}

以下是测试用例：

echo remove_phpbb_garbage("outer [size=1]inner text[/size] outer"), "\n";
echo remove_phpbb_garbage("outer [size=5:24f81ld3]inner text[/size] outer"), "\n";
echo remove_phpbb_garbage("outer [size=100:24f81ld3]inner text[/size] outer"), "\n";
echo remove_phpbb_garbage("outer [size=100:24f81ld3]inner text[/size] outer"), "\n";
echo remove_phpbb_garbage("outer [size=5:24f81ld3]inner text[/size:24f81ld3] outer"), "\n";
echo remove_phpbb_garbage("outer [size=100:24f81ld3]inner text[/size:24f81ld3] outer"), "\n";
echo remove_phpbb_garbage("[b:2q9o3yfx][size=2:2q9o3yfx][font=Arial:2q9o3yfx]Please be careful on how to Jail break your Iphone. In case if you are not already did it. There is a lot of specific instructions How to Jail break your phone on the web. Please read up before attempting a Jail break.[/font:2q9o3yfx][/size:2q9o3yfx][/b:2q9o3yfx] _________________ [bg2ads1:2q9o3yfx][/bg2ads1:2q9o3yfx]"), "\n";

这是输出：

outer inner text outer
outer inner text outer
outer [size=100:24f81ld3]inner text[/size] outer
outer [size=100:24f81ld3]inner text[/size] outer
outer inner text outer
outer [size=100:24f81ld3]inner text[/size:24f81ld3] outer
[b:2q9o3yfx][font=Arial:2q9o3yfx]Please be careful on how to Jail break your Iphone. In case if you are not already did it. There is a lot of specific instructions How to Jail break your phone on the web. Please read up before attempting a Jail break.[/font:2q9o3yfx][/b:2q9o3yfx] _________________ [bg2ads1:2q9o3yfx][/bg2ads1:2q9o3yfx]

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重要提示：该函数不正确处理嵌套的size标签！

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如果您对正则表达式感兴趣，这个精彩的资源涵盖了它们的所有细节和风格： http://www.regular-expressions.info/

Answer 2

下面的正则表达式只有当它的值正好是一个字符时才会匹配大小标签。

正则表达式：

\[(size)=[^:]:([^\]\[]*)\]([^\[\]]*)\[\/\1:\2]

替换字符串：

$3

DEMO

代码是，

preg_replace('~\[(size)=[^:]:([^\]\[]*)\]([^\[\]]*)\[\/\1:\2]~', '$3', $str);