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Asked: 2026-05-15T15:19:11+00:00

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

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

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

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

    Edit: 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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