You are searching for a static string; regular expressions may not be needed for that. I would suggest the following. Note that I suggest returning a Boolean instead of a string. I don't understand the rules for determining True or False; your current code will always return False because that's always the last line you execute. The code below will return TRUE if the string contains any of the words searched for:
If you really want to use regexp because the word boundaries are important (in addresses I don't think they are but you know what you need) then try this:
I have not tested this but would be happy to if you provide your test data.
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