如何在花括号之间找到多行文本?

I have next input string:

我有下一个输入字符串:

ANIM "_NAME_KEY_" // Index = 26, AFrames = 1
    {
        0x301C
        AF  0x201C  1   0   0   FREE_ROTATE 0   FREE_SCALE_XY 100 100
    }
ANIM