regular expressionによるmatching

find()は部分一致検索
lookingAtは先頭一致
matchesは完全一致

        String s = "ABC1DEF";
        Pattern p = Pattern.compile("[A-Z]{3}");
        Matcher mc = p.matcher(s);
        System.out.println(mc.find());
        System.out.println(mc.group());
        System.out.println(mc.find());
        System.out.println(mc.group());
        System.out.println(mc.find());
        System.out.println("-----------------");
        System.out.println(mc.lookingAt());
        System.out.println(mc.group());
        System.out.println(mc.lookingAt());
        System.out.println(mc.group());
        System.out.println("-----------------");
        System.out.println(mc.matches());
        mc = p.matcher("ABC");
        System.out.println(mc.matches());

true
ABC
true
DEF
false
-----------------
true
ABC
true
ABC
-----------------
false
true