test task solve

gistfile1.rb

str = "111222333" * 1000000

a = Time.now
str.scan(/(0+|1+|2+|3+|4+|5+|6+|7+|8+|9+)/).map { |i| "#{i[0].size}#{i[0][0]}" }.join
puts Time.now - a

a = Time.now
str.scan(/((\d)\2*)/).map { |i| "#{i[0].size}#{i[1]}"}.join
puts Time.now - a

a = Time.now
str.scan(/(\d)(\1*)/).map { |i| "#{i[1].size + 1}#{i[0]}" }.join
puts Time.now - a


#4.170684232
#3.517496366
#3.928271342