http://www.codeguru.com/Cpp/Cpp/string/regex/article.php/c2791
http://www.15seconds.com/Issue/020606.htm
http://www.funduc.com/regexp.htm
http://www.15seconds.com/Issue/010301.htm
http://www.javaworld.com/javaworld/jw-07-2001/jw-0713-regex.html?page=3
