Snobol4 语言实战：Markdown【1】 链接文本【2】与 URL【3】 分离
Markdown 是一种轻量级标记语言，常用于格式化文本。在 Markdown 中，创建链接的方式是使用方括号和圆括号，例如 `[链接文本](URL)`。在实际应用中，我们可能需要将链接文本和 URL 分离出来，以便进行进一步的处理或分析。本文将使用 Snobol4 语言来实现这一功能，并探讨其背后的技术细节。
Snobol4 简介
Snobol4 是一种高级编程语言【4】，最初由 Calvin Mooers【5】 在 1962 年设计。它以其强大的字符串处理【6】能力而闻名，特别适合于文本处理【7】任务。Snobol4 的语法简洁，易于理解，这使得它在文本处理领域有着广泛的应用。
Markdown 链接文本与 URL 分离的需求
在处理 Markdown 文档时，我们可能需要以下几种情况：
1. 提取链接文本。
2. 提取 URL。
3. 分析链接文本和 URL 的关系。
4. 对链接进行格式化或验证。
为了满足这些需求，我们需要编写一个 Snobol4 程序，能够识别 Markdown 链接的格式，并将链接文本和 URL 分离出来。
Snobol4 程序设计【8】
以下是一个 Snobol4 程序，用于分离 Markdown 链接文本和 URL。
```snobol
:read line
| [link] ( [url] ) $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] = line
| $
[link] = line
[url] = line
| $
[link] = ""
[url] = ""
| $
[link] = line
[url] = ""
| $
[link] = ""
[url] =
Comments NOTHING