Ruby:每 X 个字符插入一个空格 [英] Ruby: Insert spaces every X number of characters

问题描述

在 ruby​​ 字符串中，如何每 X 个字符插入一个空格?

In a ruby string, how can I insert a space every X number of characters?

例如，我想在给定字符串的每 8 个字符处插入一个空格.

As an example, I'd like to insert a space every 8 characters of a given string.

推荐答案

>> s = "1234567812345678123456781234567812345678"
=> "1234567812345678123456781234567812345678"
>> s.gsub(/(.{8})/, '\1 ')
=> "12345678 12345678 12345678 12345678 12345678 "

您可以使用正向前瞻来避免在末尾添加额外的空格:

You could use positive lookahead to avoid adding an extra space at the end:

>> s.gsub(/(.{8})(?=.)/, '\1 \2')
=> "12345678 12345678 12345678 12345678 12345678"

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