Function extract_lang_label 

pub fn extract_lang_label(text: &str) -> Option<String>

Extracts the language label from a Markdown-style code block.

This function looks for the first occurrence of a triple backtick (“```”), then captures everything from immediately after it up to the next newline. That captured substring is returned as the language label (e.g., “rust”, “python”).

Arguments

• text - A string slice that may contain a Markdown code block.

Returns

• Some(String) containing the language label if a code block is found and a newline follows the opening backticks.
• None if no opening backticks or newline is found.

Example

let input = "Here is code:\n```rust\nfn main() {}\n```";
let lang = ys1r::markdown::extract_lang_label(input);
assert_eq!(lang, Some("rust".to_string()));