Regex

• https://dzone.com/articles/java-regex-simple-patterns

• https://www.javaworld.com/article/3188545/java-101-regular-expressions-in-java-part-1.html

• https://www.javaworld.com/article/2073175/study-guide--regular-expressions-simplify-pattern-matching-code.html

• https://www.javaworld.com/article/3195301/java-101-regular-expressions-in-java-part-2.html

• https://www.youtube.com/watch?v=ZfQFUJhPqMM

• https://www.sitepoint.com/learn-regex/