In Ruby, can I check if a string contains a letter without using regular expressions? - YouTube
check if a string contains only letters in Ruby
Introduction to Ruby
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Ruby Join Example (Convert Array to String) - Dot Net Perls
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Regular Expression in Ruby | Regular Expression in Ruby with Examples
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string contains null byte (ArgumentError)"と出たら、ヌル文字が入ってるので消す - Bye Bye Moore
