如何统计文本中目标字符串前的单词数及实现自定义tokenization？

Alright, let's break down these Markdown formatting rules with straightforward examples to make your posts look polished:

Headings #

Use number signs (#) to create hierarchical headings. The more #s you use, the smaller the heading:

• # Main Heading → # Main Heading
• ## Subheading → ## Subheading
• ### Smaller Subheading → ### Smaller Subheading

Unordered Lists #

Start every list item with a dash (-). You can nest items by indenting them with a tab or 2 spaces:

• First item in the list
• Second item
  • Nested sub-item
  • Another nested sub-item

Emphasized Text #

Wrap text with asterisks to make it stand out:

• Single asterisks for italicized text (use *your text here*)
• Double asterisks for bold text (use **your text here**)

Code & Commands #

Use backticks to set code apart from regular text:

• Inline code: Wrap short snippets in single backticks, like npm install or print("Hello World")
• Multi-line code blocks: Use three backticks at the start and end (add a language tag for syntax highlighting):

function add(a, b) {
  return a + b;
}

Quoted Text #

Use a greater-than sign (>) to create blockquotes for citing text or adding context:

This is a basic blockquote.

Want to nest quotes? Just add another > before the nested text!

Links #

Format links by putting the display text in square brackets, followed by the URL in parentheses:

• [Read the documentation](https://example.com/docs) → Read the documentation

Images #

For images, use square brackets for descriptive alt text (helpful for screen readers), then the image URL in parentheses. You can add an optional title in quotes too:

• [Sunset over mountains](https://example.com/sunset.jpg "Beautiful mountain sunset") → Renders as an image with alt text "Sunset over mountains" and a tooltip title "Beautiful mountain sunset"

内容的提问来源于stack exchange，提问作者santoku