Snobol4 语言 实战 邮箱域名格式统一实战

Snobol4^【1】 语言实战：邮箱域名^【3】格式统一实战

Snobol4 是一种古老的编程语言，最初由 Calvin Mooers^【4】 在1962年设计，主要用于文本处理^【5】。尽管它在现代编程语言中并不常见，但它的简洁性和强大的文本处理能力使其在某些特定领域仍有其应用价值。本文将围绕 Snobol4 语言，通过一个实际案例——邮箱域名格式统一实战，展示如何使用 Snobol4 语言进行数据处理。

Snobol4 语言简介

Snobol4 是 Snobol 系列语言的第四个版本，它继承了 Snobol3 的特点，并增加了一些新的功能。Snobol4 的语法简洁，易于理解，特别适合于文本处理任务。以下是 Snobol4 语言的一些基本语法元素：

- 变量^【6】：使用 `$` 符号表示。
- 字符串：使用单引号 `''` 或双引号 `""` 括起来。
- 模式匹配^【7】：使用 `@` 符号进行模式匹配。
- 循环结构^【8】：`WHILE` 和 `REPEAT`。
- 条件结构^【9】：`IF` 和 `ELSE`。

邮箱域名格式统一实战

问题背景

在处理大量邮箱数据时，常常会遇到邮箱域名格式不统一的情况。例如，有些邮箱地址使用全小写^【10】，有些使用全大写^【11】，还有些使用大小写混合^【12】。为了方便后续的数据处理和分析，我们需要将这些邮箱地址的域名部分统一为小写。

解决方案

使用 Snobol4 语言，我们可以编写一个简单的程序，将邮箱地址中的域名部分转换为小写。

代码实现

以下是一个 Snobol4 程序的示例，用于将邮箱地址的域名部分转换为小写：

```snobol
:START
INPUT<sup>【13】</sup>
$email<sup>【14】</sup>
DO<sup>【15】</sup>
$domain<sup>【16】</sup> = $email @'@' +
$domain = $domain @'.' +
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