Regex search for line of text containing multiple strings

You can use the following Regular Expression search to find individual lines of text which contain all of the designated words:

^(?=.*?\bzealous\b)(?=.*?\badvocates\b)(?=.*?\bloyalty\b).*$

This search will look for any line in a text file that contains the words, 'zealous', 'advocates', and 'loyalty'. Here's a demonstration using NotePad++.