php - preg_match acting very strange

Question

I am using preg_match() to extract pieces of text from a variable, and let's say the variable looks like this:

[htmlcode]This is supposed to be displayed[/htmlcode]

middle text

[htmlcode]This is also supposed to be displayed[/htmlcode]

i want to extract the contents of the [htmlcode]'s and input them into an array. i am doing this by using preg_match().

preg_match('/\[htmlcode\]([^\"]*)\[\/htmlcode\]/ms', $text, $matches);
foreach($matches as $value){
return $value . "<br />";
}

The above code outputs

[htmlcode]This is supposed to be displayed[/htmlcode]middle text[htmlcode]This is also supposed to be displayed[/htmlcode]

instead of

and if have offically run out of ideas

score 4 · Accepted Answer

如前所述；*模式是贪婪的。另一件事是使用preg_match_all()函数。它会返回一个匹配内容的多维数组。

preg_match_all('#\[htmlcode\]([^\"]*?)\[/htmlcode\]#ms', $text, $matches);
foreach( $matches[1] as $value ) {

score 3 · Accepted Answer

石斑鱼是贪婪的*，即它会吃掉所有东西直到最后 [/htmlcode]。尝试用*non-greedy替换*?。

score 2 · Accepted Answer

*默认情况下是贪婪的，([^\"]*?)（注意添加的?）应该使它变得懒惰。

score 2 · Accepted Answer

看这段代码：

preg_match('/\[htmlcode\]([^\"]*)\[\/htmlcode\]/ms', $text, $matches);
foreach($matches as $value){
return $value . "<br />";
}

现在，如果您的模式工作正常并且一切正常，您应该知道：

所以，你所做的是返回第一个大字符串并退出函数。

我建议您可以检查所需的结果：

$matches[1]和$matches[2]

4 回答 4