package java_base; import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexTest { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println(Pattern.matches("a * b", "aaaaab")); System.out.println("01234567890123456".matches("\\d{17}")); Pattern p = Pattern.compile("ab\\. *c"); Matcher m = p.matcher("ab..cxyzab...cxxx"); while(m.find()) { System.out.println(m.group()+ ":" + m.start() + "," + m.end()); } Scanner sc = new Scanner("1 fish 2 fish red fish blue fish"); sc.useDelimiter("\\s*fish\\s*"); while(sc.hasNext()) { } } }