php preg_replace：如何去除所有空白和 ？
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preg_replace: how do I strip off all white space and ?
提问by laukok
how do I strip off all white space and ?
我如何去除所有空白和 ？
I have this as a input in a wrapper I create,
我将此作为我创建的包装器中的输入，
[b] bold [/b]
[b] bold [/b]
so before turning the text to bold, i want to strip off all white spaces and  , and turn it into [b]bold[/b],
所以在将文本变成粗体之前，我想去掉所有的空格和 ，然后把它变成[b]bold[/b]，
$this->content = preg_replace("/\[(.*?)\]\s\s+(.*?)\s\s+\[\/(.*?)\]/",
"[][/]",
$this->content);
but it does not work! can you help please?
但它不起作用！你能帮忙吗？
回答by codaddict
There is no need for a regex based solution. You can simply use str_replaceas:
不需要基于正则表达式的解决方案。您可以简单地str_replace用作：
$input = "[b] bold [/b]";
$input = str_replace(array(' ',' '),'',$input);
echo trim($input); // prints [b]bold[/b]
回答by laukok
I found another solution
我找到了另一个解决方案
$this->content = preg_replace("/\[(.*?)\]\s*(.*?)\s*\[\/(.*?)\]/", "[][/]", html_entity_decode($this->content));
回答by NikiC
$this->content = preg_replace(
'~\[(.*?)](?:\s| )*(.*?)(?:\s| )*\[/\1]/',
'[][/]',
$this->content
);
回答by mkb
You can just replace the spaces with empty strings, e.g.
您可以用空字符串替换空格，例如
preg_replace("/(?:\s| )+/", "", $this->content, -1)
The -1 causes the replace to hit every instance of the match.
-1 导致替换命中匹配的每个实例。
回答by Adam Ranganathan
A little late to answer but hopefully might help someone else. The most important thing while extracting content from html is to use utf8_decode()in php. Then all other string operations become a breeze. Even foreign characters can be replaced by directly copy pasting characters from browser into the php code.
回答有点晚，但希望可以帮助别人。从 html 中提取内容时最重要的是在 php 中使用utf8_decode()。然后所有其他字符串操作变得轻而易举。甚至可以通过直接从浏览器复制粘贴字符到php代码中来替换外来字符。
The following function replaces with empty character. Then all white spaces are replaced with empty character using preg_replace().
以下函数替换 为空字符。然后使用preg_replace().将所有空格替换为空字符。
function clean($str)
{
$str = utf8_decode($str);
$str = str_replace(" ", "", $str);
$str = preg_replace("/\s+/", "", $str);
return $str;
}
$html = "[b] bold [/b]";
$output = clean($html);
echo $output;
[b]bold[/b]
[b]粗体[/b]
回答by David
Another method that would work is:
另一种可行的方法是：
$this->content = trim(str_replace(' ','',$this->content));
PHP Manual links:
PHP手册链接：
trim() http://us.php.net/trim
*note: This is assuming $this->content contains only the string posted by OP
*注意：这是假设 $this->content 只包含 OP 发布的字符串
回答by poke
To give you a complete solution with regular expressions as well:
为了给你一个完整的正则表达式解决方案：
$this->content = preg_replace( '/\[([a-z]+)\](?: |\s)*(.*?)(?: |\s)*\[\/([a-z]+)\]/', '[][/]', $this->content );
But in this case you should rather combine the whitespace removal and bbcode transformation to make sure that the tags are correctly:
但在这种情况下，您应该将空格删除和 bbcode 转换结合起来，以确保标签正确：
$this->content = preg_replace( '/\[b\](?: |\s)*(.*?)(?: |\s)*\[\/b]/', '<b></b>', $this->content );
