Java经典实例：使用正则表达式：测试模式

import java.util.regex.Pattern;

/**

 * Created by Frank

 * 在Java中使用正则表达式：测试模式

 */

public class RESimple {

    public static void main(String[] args) {

        String pattern = "^Q[^u]\\d+\\.";

        String[] input = {"QA777. is the next flight. It is on time.", "Quack, Quack, Quack!"};

        Pattern p = Pattern.compile(pattern);

        for (String s : input) {

            /**

             * 在字符串中匹配模式，从字符串的首字母开始，或者之前已经成功调用该方法，则从未能符合前面匹配的第一个字符开始

             */

            boolean found = p.matcher(s).find();

            System.out.println("'" + pattern + "' " + (found ? " matches '" : "doesn't match '") + s + "'");

        }

    }

}

输出：

'^Q[^u]\d+\.'  matches 'QA777. is the next flight. It is on time.'

'^Q[^u]\d+\.' doesn't match 'Quack, Quack, Quack!'