java正则学习笔记

/**
 * [abc] a、b 或 c（简单类） 
    [^abc] 任何字符，除了 a、b 或 c（否定） 
    [a-zA-Z] a 到 z 或 A 到 Z，两头的字母包括在内（范围） 
    [a-d[m-p]] a 到 d 或 m 到 p：[a-dm-p]（并集） 
    [a-z&&[def]] d、e 或 f（交集） 
    [a-z&&[^bc]] a 到 z，除了 b 和 c：[ad-z]（减去） 
    [a-z&&[^m-p]] a 到 z，而非 m 到 p：[a-lq-z]（减去） 

 */
public static void main(String[] args) {
    //demo1();
    //demo2();
    //demo3();
    //demo4();
    //demo5();
    //demo6();
    String regex = "[a-z&&[^m-p]]";
    System.out.println("m".matches(regex));
    System.out.println("a".matches(regex));
    System.out.println("z".matches(regex));
    System.out.println("n".matches(regex));
}

private static void demo6() {
    String regex = "[a-z&&[^bc]]";
    System.out.println("a".matches(regex));
    System.out.println("b".matches(regex));
    System.out.println("1".matches(regex));
}

private static void demo5() {
    String regex = "[a-z&&[def]]";                      //取交集
    System.out.println("a".matches(regex));
    System.out.println("d".matches(regex));
}

private static void demo4() {
    String regex = "[a-d[m-p]]";
    System.out.println("a".matches(regex));
    System.out.println("m".matches(regex));
    System.out.println("n".matches(regex));
}

private static void demo3() {
    String regex = "[a-zA-Z]";
    System.out.println("a".matches(regex));
    System.out.println("A".matches(regex));
    System.out.println("z".matches(regex));
    System.out.println("Z".matches(regex));
    System.out.println("1".matches(regex));
    System.out.println("%".matches(regex));
}

private static void demo2() {
    String regex = "[^abc]";
    System.out.println("a".matches(regex));
    System.out.println("b".matches(regex));
    System.out.println("c".matches(regex));
    System.out.println("d".matches(regex));
    System.out.println("1".matches(regex));
    System.out.println("%".matches(regex));
    System.out.println("10".matches(regex));        //10代表1字符和0字符,不是单个字符
}

private static void demo1() {
    String regex = "[abc]";                 //[]代表单个字符
    System.out.println("a".matches(regex));
    System.out.println("b".matches(regex));
    System.out.println("c".matches(regex));
    System.out.println("d".matches(regex));
    System.out.println("1".matches(regex));
    System.out.println("%".matches(regex));
}

}

java正则学习笔记

原文：http://blog.51cto.com/357712148/2133858