Regular expression syntax for “match nothing”?

Question

I have a python template engine that heavily uses regexp. It uses concatenation like:

re.compile( regexp1 + \"|\" + regexp2 + \"*|\" + regexp3 + \"+\" )
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Answer 1

You could use
\z..
This is the absolute end of string, followed by two of anything

If + or * is tacked on the end this still works refusing to match anything