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  1. s = 'there is a cat in the hat.it has a 2.0 inch tail!'
  2. puts s.gsub(/(\A|[.?!])(\p{Ll})/) { Regexp.last_match(1).length > 0 ? "#{$1} #{$2.capitalize}" : "#{$2.capitalize}" }
Success #stdin #stdout 0.02s 9784KB
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There is a cat in the hat. It has a 2.0 inch tail!
https://ideone.com/ECEUpW
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
secret

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