Snobol4 语言 实战 特殊符号清洗与过滤实战

Snobol4阿木 发布于 7 天前 4 次阅读

Snobol4【1】 语言实战：特殊符号【2】清洗【3】与过滤【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。本文将围绕Snobol4 语言，探讨如何进行特殊符号的清洗与过滤，以实现文本数据的净化。

Snobol4 简介

Snobol4 是一种高级编程语言，特别适合于文本处理。它具有以下特点：

- 强大的字符串处理【6】能力
- 简洁的语法
- 高效的模式匹配

Snobol4 的语法相对简单，主要由模式（pattern）、动作（action）和变量（variable）组成。模式用于匹配文本，动作用于处理匹配到的文本，变量用于存储数据。

特殊符号清洗与过滤的需求

在处理文本数据时，特殊符号的存在可能会影响数据的准确性和可读性。对特殊符号进行清洗与过滤是文本处理的重要步骤。以下是一些常见的特殊符号清洗与过滤需求：

- 去除非法字符【7】
- 替换特殊字符
- 过滤掉无意义的字符
- 标准化【8】文本格式

Snobol4 特殊符号清洗与过滤实战

1. 去除非法字符

以下是一个Snobol4程序，用于去除字符串中的非法字符：

```snobol
: illegal "!" "%" "&" "/" ":" ";" "" "?" "@" "["
illegal: = ( illegal ) | illegal
illegal: = ( illegal ) | illegal
illegal: = ( illegal ) | illegal
illegal: = ( illegal ) | illegal
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