Question

Is there an elegant regex-way with Ruby to replace all occurrences of °C to °F in a string (while at the same time converting the units)? For example:

“Today it is 25°C and tomorrow 27 °C.”

should result in something like:

“Today it is 77°F and tomorrow 81 °F.”

Answer 1

# -*- encoding : utf-8 -*-
def c2f(c)
  c*9.0/5+32
end

def convert(string)
  string.gsub(/\d+\s?°C/){|s| "#{c2f(s[/\d+/].to_i)}°F"}
end

puts convert("Today it is 25°C and tomorrow 27 °C.")
# result is => Today it is 77.0°F and tomorrow 80.6°F.