My attempted to write the start of a regex system. Prompted by a Q on LeetCode. It is also to help understand compilers a bit more.
To run simple regex use SimpleRegex. To run the more elaborate version of regex use the api in MaxRegex.
Simple Regex
import src.regex.SimpleRegex;
String testString = "AABBCC";
String pattern = "AAB+C.";
SimpleRegex regex = new SimpleRegex(testString, pattern);
// 'matches' will be true.
boolean matches = regex.matches();Elaborate Regex
import src.regex.MaxRegex;
String testString = "AABBCC";
String pattern = "AAB+C.";
// 'matches' will be true.
boolean matches = MaxRegex.whollyContainedIn(pattern, testString);