如何用正则处理跨多行日志：保留/移除含指定关键词的完整条目

• Headings: Use number signs (#). The count of # indicates the heading level (e.g., # Level 1 Heading, ## Level 2 Heading).
• List Items: Start with dashes (-). For nested lists, indent sub-items appropriately.
• Emphasized Text: Wrap content with asterisks (*). Use *italic text* for italic emphasis and **bold text** for bold emphasis.
• Code/Commands: Surround content with backticks (`). Inline code uses single backticks, while multi-line code blocks use triple backticks (```).
• Quoted Text: Use greater than signs (>). For multi-line quotes, prepend > to each line or use a single > at the start of the block.
• Links: Wrap display text in square brackets ([]), followed by the target URL in parentheses (()). Example: [Sample Link](https://example.com).
• Images: Use square brackets ([]) for alt text, followed by the image URL in parentheses (()). Example: [Sample Image Alt Text](https://example.com/image.png).

内容的提问来源于stack exchange，提问作者Avibright