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!'