如题，在UITextView 是聊天界面的输入框，因为要输入自定义表情，所以就有这样的字符串:[调皮][大哭]
现在有一个删除按钮用于删除UITextView 中光标前面的特殊字符串，比如点了删除按钮后要删除"你好啊[调皮]吃饭了吗？[大哭]"中的"[大哭]"，如果是这样:"你好啊[调皮]吃饭了吗",则删除"吗" 请问各路大侠，有什么思路？
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Determine whether the last one is "]", then determine the length of characters in "[" and "]" (for more accuracy), use the index to locate "[]", and delete it
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Determine whether the last one is "]", then determine the length of characters in "[" and "]" (for more accuracy), use the index to locate "[]", and delete it