java怎么利用正則表達(dá)式？

String testString = "java怎么利用正則表達(dá)式從給定的字符串中取出匹配規(guī)則字符串";

Pattern pattern = Pattern.compile("\\w+");

Matcher matcher = pattern.matcher(testString);

while(matcher.find())

{

System.out.println(matcher.group());

}