Ruby remove substring matching to any element of array

Ruby remove substring matching to any element of array

I have a string say

str ="this is the string "

and i have an array of string say

array =["this is" ,"second element", "third element"]

I want to process the string such that sub string matching any of the element of array should be removed and rest of the string should be return.So i want the following output.

output: "the string "

How can i do this in ruby.solution 1:

str = "this is the string "
array = ["this is" ,"second element", "third element"]
pattern = /\b(?:#{ Regexp.union(array).source })\b/ # => /\b(?:this\ is|second\ element|third\ element)\b/

str[pattern] # => "this is"
str.gsub(pattern, '').squeeze(' ').strip # => "the string"

solution 2:

array =["this is" ,"second element", "third element"]str = "this is the string "str.gsub(Regexp.union(array),'') # => " the string "