用正则表达式使类名首字母大写

Question

我有多个课程

class actors extends CI_Controller {
}    

class movies extends CI_Controller {
}

class producers extends CI_Controller {
}

class shows extends CI_Controller {
}

我想使用大写的类名作为结果

class Actors extends CI_Controller {
}    

class Movies extends CI_Controller {
}

class Producers extends CI_Controller {
}

class Shows extends CI_Controller {
}

所以我必须找到并用正则表达式替换。

找到 class\s

替换 class\s

我如何大写类名？