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

if you looking for a particular character, you can make a range of characters that you want to include and check if what you consider to be a special character is not part of that arsenal

puts String([*"a".."z"].join).include? "a"    #true
puts String([*"a".."z"].join).include? "$"    #false

I think this is flexible because here you are not limited as to what should be excluded

puts String([*"a".."z",*0..9,' '].join).include? " "   #true