正則表達式幫助匹配字符串

Question

尋找一些使用PHP的正則表達式幫助。什麼是regex以下：

EXACTLY {{file: THEN 24 characters from a-zA-Z0-9 THEN EXACTLY }} 

例子：

{{file:504c2ee3ff558cb40700000b}} 

展望匹配模式。非常感謝。

Answer 1

嘗試：

preg_match_all('/\{\{file:[a-zA-Z\d]{24}\}\}/', $str, $matches); 

Answer 2

試試這個，

preg_match_all('((\{{2})file:([a-z0-9]){24}(\}{2})/i', $str, $matches);