How to check string contains special character in ruby

Question

How to check whether a string contains special character in ruby. If I get regular expression also it is fine.

Please let me know

Answer 1

How about this command in Ruby 2.0.0 and above?

def check_for_a_special_charachter(string)   
  /\W/ === string
end

Therefore, with:

!"He@llo"[/\W/].nil?  => True

!"Hello"[/\W/].nil?   => False