提取 Markdown【1】 中纯文本内容的 Snobol4【2】 语言实现
Markdown 是一种轻量级标记语言，常用于格式化文本。由于其简洁易用的特性，Markdown 在博客、文档和代码注释中得到了广泛应用。在实际应用中，我们可能需要从 Markdown 文档中提取纯文本内容，以便进行进一步的处理或分析。本文将探讨如何使用 Snobol4 语言来实现这一功能。
Snobol4 是一种古老的编程语言，以其强大的字符串处理【3】能力而闻名。尽管 Snobol4 在现代编程中并不常见，但其独特的字符串处理功能使其成为处理文本数据的理想选择。本文将展示如何使用 Snobol4 语言编写一个程序，从 Markdown 文档中提取纯文本内容。
Snobol4 简介
Snobol4 是一种高级编程语言，由 David J. Farber 和 Ralph E. Griswold 在 1962 年设计。它以其强大的字符串处理能力而著称，特别是在模式匹配【4】和字符串替换【5】方面。Snobol4 的语法【6】简洁，易于理解，这使得它在处理文本数据时非常高效。
Snobol4 的基本数据类型【7】是字符串，它提供了丰富的字符串操作函数，如 `match`、`replace`、`delete` 等。这些函数使得 Snobol4 成为处理文本数据的强大工具。
Markdown 语法【8】简介
Markdown 的语法相对简单，以下是一些基本的 Markdown 语法元素：
- 阿木博主一句话概括：使用 `` 符号表示，`` 的数量表示标题的级别。
- 粗体：使用 `` 或 `` 包围文本。
- 斜体：使用 `` 或 `_` 包围文本。
- 列表：使用 `-`、`` 或 `+` 开头的行来创建无序列表【9】，使用数字和句点创建有序列表【10】。
- 链接【11】：使用 `[链接文本](URL)` 表示。
- 图片【12】：使用 `` 表示。
Snobol4 程序设计
为了从 Markdown 文档中提取纯文本内容，我们需要编写一个 Snobol4 程序，该程序能够识别并去除 Markdown 的格式化元素。
以下是一个简单的 Snobol4 程序示例，用于提取 Markdown 中的纯文本内容：
```snobol
:input
input:in
output:out
:process
in match "^[-+ ]" out delete
in match "^[+]" out delete
in match "^_" out delete
in match "^$" out delete
in match "^$" out delete
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