精通正则表达式383页例子展开

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

public class ReplaceString {

	public static void main(String[] args) {
		StringBuilder text = new StringBuilder("It's SO very RUDE to shout !");
		Matcher m = Pattern.compile("\\b[\\p{Lu}\\p{Lt}]+\\b").matcher(text);
		while (m.find()) {
			text.replace(m.start(), m.end(), m.group().toLowerCase());
			System.out.println(">>>>>> "+m.group(0));
		}
		
		
		//注意这二者（find,matches)之间的区别，jdk源码中很清楚
		if(m.matches()){
			System.out.println(">>>>>> "+m.group(0));
			
		}
		System.out.println(text);
	}

}