Snobol4【1】 语言实战：HTML【2】 元数据【3】内容转 JSON【4】 实战
Snobol4 是一种古老的编程语言，最初在1962年由David J. Farber、Ralph E. Griswold 和 Ivan P. Polonsky 在贝尔实验室开发。尽管它已经不再广泛使用，但Snobol4 在文本处理和模式匹配【5】方面有着独特的优势。本文将探讨如何使用Snobol4 语言实现一个简单的HTML元数据内容转换为JSON的实用程序。
Snobol4 简介
Snobol4 是一种高级编程语言，特别适合于文本处理任务。它具有强大的字符串操作【6】和模式匹配功能，这使得它在处理HTML文档时非常有用。Snobol4 的语法相对简单，易于学习，但它的强大功能使其在特定领域内非常有效。
HTML 元数据内容转 JSON
HTML文档中的元数据通常包含在``标签【7】中，这些数据对于搜索引擎优化【8】（SEO）和网站性能至关重要。将HTML元数据转换为JSON格式可以帮助我们更好地管理和使用这些数据。
实战步骤
1. 解析【9】HTML文档：我们需要解析HTML文档以提取``标签中的内容。
2. 提取元数据：从解析后的HTML中提取出具体的元数据，如标题、描述、关键词等。
3. 转换为JSON格式：将提取的元数据转换为JSON格式。
Snobol4 代码实现
以下是一个简单的Snobol4程序，用于将HTML元数据转换为JSON格式。
```snobol
:begin
'htmlfile = "example.html" % 定义HTML文件路径
'jsonfile = "metadata.json" % 定义输出JSON文件路径
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