从Wiki XML语法中提取图像路径

Question

i try to parse the Wikipedia XML which i get from the xml wikipedia export

In one case i need to extract all image path. The raw markup looks like,

  [[Bild:nameOfImage.png|image description]]

"Bild" can also be "Image", "File" or "Datei"

To extract the text for an Image i use this regex.

'|\[\[.*\|.*\]\]|U'

This works fine, if in the image description isn't an other '[[ .. ]]', like

[[Bild:nameOfImage.png|image Description with a [[new wiki link]] ]]

My question is, how can i modify the Regex to get all text between the first "[[" and the last "]]" without to count all '[' an ']' character.

thanks in advance

Answer 1

Since you're using PHP, you're probably able to use recursive patterns.
Considering you're not capturing anything:

/\[\[(((?>[^\[\]])|(?R))*)\]\]/U

Note that I haven't tried this regex since I have no way to use PHP.

Edit:

preg_match('/\[\[(?>[^\[\]]|(?R))*\]\]/U', '[[Bild:nameOfImage.png|image Description with a [[new wiki link]] ]]', $array);
var_dump($array);

seems to work.