自定义Pandoc Writer/Filter：BulletList转BBCode遇格式问题求助

Below are the core rules for formatting content with Markdown:

• Headings: Use number signs (#) at the start of a line. The number of # characters corresponds to the heading level (e.g., # for Level 1, ## for Level 2).
• Unordered Lists: Start list items with dashes (-).
• Text Emphasis: Wrap text with asterisks (*) to apply italic formatting, or double asterisks (**) for bold formatting.
• Code & Commands: Surround code snippets, terminal commands, or inline code with backticks (`).
• Block Quotes: Prefix lines with greater than signs (>) to create quoted text blocks.
• Links: Format links by wrapping display text in square brackets ([]), followed by the target URL in parentheses (()). Example: [Example Link](https://example.com).
• Images: For images, use an exclamation mark (!) followed by square brackets ([]) for alt text, then the image URL in parentheses (()). Example: ![Sample Image](https://example.com/image.jpg).

内容的提问来源于stack exchange，提问作者Patrick Bucher