提取第二次出现特定字符后第二次出现另一个字符的字符串部分[关闭]

Question

How can extract piece of string which is located between second occurrence of the ":" character and second occurrence of "," in piece of string?

substr() can't help me, since the length of the peace of the string that I want to extract may vary. I am not posting any code, since I have no clue where to start from. I am searching string manipulation functions, but without any luck so far. I am not sure if this can be done with regular expressions either, since it is second concurrence.

Here is the part of the string that I am trying to manipulate

[3] => 93,text:Πού είναι αυτή η πόλη:,photo:c083,correct:2,answers:[{text:Βενεζουέλα.,correct:false},{text:Βραζιλία.,correct:false},{text:Πέρυ.,correct:true}]},{

Answer 1

Id try something like the following assuming you're always trying to get the photo value:

$str = "93,text:Πού είναι αυτή η πόλη:,photo:c083,correct:2,answers:[{text:Βενεζουέλα.,correct:false},{text:Βραζιλία.,correct:false},{text:Πέρυ.,correct:true}]},{";
preg_match_all('/photo:[\w+]*/', $str, $match);
$photo = explode(':', $match[0][0]);
$photo_id = $photo[1];
echo $photo_id;
// > c083

Hope that helps.