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Clean up the words(CODEEVAL)

英数字以外を抽出する問題。簡単。

CHALLENGE DESCRIPTION:

You have a list of words. Letters of these words are mixed with extra symbols, so it is hard to define the beginning and end of each word. Write a program that will clean up the words from extra numbers and symbols.

INPUT SAMPLE:

The first argument is a path to a file. Each line includes a test case with a list of words: letters are both lowercase and uppercase, and are mixed with extra symbols.

(--9Hello----World...--)
Can 0$9 ---you~
13What213are;11you-123+138doing7

OUTPUT SAMPLE:

hello world
can you
what are you doing

CONSTRAINTS:

  1. Print the words separated by spaces in lowercase letters.
  2. The length of a test case together with extra symbols can be in a range from 10 to 100 symbols.
  3. The number of test cases is 40.

My Code

#!/usr/bin/env ruby -w
def clenup(words)
  words.gsub(/[^A-Za-z]/, " ").downcase.split.join(" ")
end

ARGF.each_line do |line|
  puts clenup(line.chomp)
end