What's the fastest way to check if a word from one string is in another string?

Question

I have a string of words; let\'s call them bad:

bad = \"foo bar baz\"

I can keep this string as a whitespace separated string,

Answer 1

bad = %w(foo bar baz)
str = "This is my first foo string"

# find the first word in the list
found = bad.find {|word| str.include?(word)}

# remove it
str[found] = ''  ;# str => "This is my first  string"