Snobol4 语言 实战 XML 标签属性值提取技巧

Snobol4 语言实战：XML 标签属性值提取技巧

Snobol4 是一种古老的编程语言，最初在1962年由Calvin Mooers 设计。尽管它已经不像其他现代编程语言那样流行，但Snobol4 在文本处理和模式匹配方面有着独特的优势。本文将围绕Snobol4 语言，探讨如何使用其强大的文本处理能力来提取XML标签的属性值。

Snobol4 简介

Snobol4 是一种高级编程语言，特别适合于文本处理和模式匹配。它具有以下特点：

- 模式匹配：Snobol4 提供了强大的模式匹配功能，可以轻松地处理字符串。
- 流控制：Snobol4 支持多种流控制结构，如循环、条件语句等。
- 数据结构：Snobol4 提供了数组、列表等数据结构，方便处理复杂数据。

XML 标签属性值提取需求

在处理XML数据时，我们经常需要提取标签的属性值。例如，以下XML片段：

xml

Snobol4 Programming
John Doe

我们需要提取``标签的`id`属性值，即`12345`。

Snobol4 代码实现

以下是一个使用Snobol4 提取XML标签属性值的示例代码：

```snobol
:input
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