testgroup.java

词法分析器

import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class TestGroup {

    public static void main(String[] args) {
        //Pattern p = Pattern.compile("(\\d{3,5})([a-z]{2})");
    	Pattern p = Pattern.compile("/\\*.*\\*/|\'.+\'|(\\++|\\--|\\>=|\\<=)|\\d+\\.\\d*|\\w+|\".+\"|\\S");
       // Matcher m = p.matcher("4124jh-981af-6346ls");
        Matcher m = p.matcher(
        		"integer a;" +
        		"program ss " +
        		"begin" +
        		"$@#&***(!@" +
        		"("+"if(a>100)"+"end;"+"var xx")
        		;
        while (m.find()) {
            p(m.group());
        }
    }
    
    public static void p(Object o) {
        System.out.println(o);
    }
}