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gsub_with_block

🧩 Transform Captures with gsub and Block​

Combine regex with String#gsub blocks to process each match dynamically. Use named captures for clarity and apply custom logic in the block for powerful in-place transformations.

text = 'Order: #123, #456'
result = text.gsub(/#(?<id>\d+)/) do
  id = Regexp.last_match[:id].to_i
  "ORDER-#{format('%05d', id)}"
end
#=> "Order: ORDER-00123, ORDER-00456"