Check if string contains any substring in an array in Ruby

There are multiple ways to accomplish that. You could check each string until a match is found using Enumerable#any?:

str = "alo eh tu"
['alo','hola','test'].any? { |word| str.include?(word) }

Though it might be faster to convert the array of strings into a Regexp:

words = ['alo','hola','test']
r = /#{words.join("|")}/ # assuming there are no special chars
r === "alo eh tu"