PHP preg_match_all()匹配过多

Question

我有一个名为$content的变量，它包含DokuWiki Markdown文件的内容。

我试图匹配样式为：[[http://url.com/|title]]的所有链接。

下面是我试图与之匹配的变量的一部分：

[[http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2FgettingStarted%2Fqs-37-3c.htm|Eclipse]], [[https://msdn.microsoft.com/en-us/library/xc3ed5eh%28v=vs.90%29.aspx|Visual Studio]] and [[https://www.jetbrains.com/idea/help/managing-bookmarks.html|IntelliJ Idea]]

我当前的正则表达式是：/\[\[(.*)\|([\w\s]+?)\]\](?=\,|\s)/，但它与我前面列出的整个部分相匹配，包括,和and。

我想要的是每个链接都分开，所以我要从preg_match_all('/regular_expression/', $content, $links);中寻找的结果是：

$links[0][0] = [[http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2FgettingStarted%2Fqs-37-3c.htm|Eclipse]]
$links[0][1] = [[https://msdn.microsoft.com/en-us/library/xc3ed5eh%28v=vs.90%29.aspx|Visual Studio]]
$links[0][2] = [[https://www.jetbrains.com/idea/help/managing-bookmarks.html|IntelliJ Idea]]

$links[1][0] = http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2FgettingStarted%2Fqs-37-3c.htm
$links[1][1] = https://msdn.microsoft.com/en-us/library/xc3ed5eh%28v=vs.90%29.aspx
$links[1][2] = https://www.jetbrains.com/idea/help/managing-bookmarks.html

$links[2][0] = Eclipse
$links[2][1] = Visual Studio
$links[2][2] = IntelliJ Idea

Answer 1

我想这就是你想要的：

$string = '[[http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2FgettingStarted%2Fqs-37-3c.htm|Eclipse]], [[https://msdn.microsoft.com/en-us/library/xc3ed5eh%28v=vs.90%29.aspx|Visual Studio]] and [[https://www.jetbrains.com/idea/help/managing-bookmarks.html|IntelliJ Idea]]';
preg_match_all('/\[{2}(.+?)\|([\w\s]+?)\]{2}/', $string, $links);
print_r($links);

输出：

Array
(
    [0] => Array
        (
            [0] => [[http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2FgettingStarted%2Fqs-37-3c.htm|Eclipse]]
            [1] => [[https://msdn.microsoft.com/en-us/library/xc3ed5eh%28v=vs.90%29.aspx|Visual Studio]]
            [2] => [[https://www.jetbrains.com/idea/help/managing-bookmarks.html|IntelliJ Idea]]
        )

    [1] => Array
        (
            [0] => http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2FgettingStarted%2Fqs-37-3c.htm
            [1] => https://msdn.microsoft.com/en-us/library/xc3ed5eh%28v=vs.90%29.aspx
            [2] => https://www.jetbrains.com/idea/help/managing-bookmarks.html
        )

    [2] => Array
        (
            [0] => Eclipse
            [1] => Visual Studio
            [2] => IntelliJ Idea
        )

)

Regex101演示：https://regex101.com/r/iM4kG3/1

只需要你的*是非贪婪的?，你可能在|之前想要一些东西，所以把量词变成+ (一个或多个)；如果你不在乎那里有什么东西，可以把它改为*。