Use the left field and button to search athlete's names using regular expressions. If you don't know what a regular expression is, don't worry about it. It's a computer geek thing. The results are limited to the first 500 matches.
Use the right field and button to find all athletes from a given country who've competed in an international contest. Note that some of the names aren't really countries, or are no longer countries. But for international amateur contests where athlete's countries were listed, they've been included in the database. Note that sometimes international contests would list United Kingdom, other times, England, Scotland, and Wales. Same with Neatherlands and Holland, Germany and West Germany.