JAVA正则表达式

• • java正则表达式

一个简单的例子

package integer_;

public class Test {
    public static void main(String[] args) {
        Integer a=10;
        int b=a;///自动拆箱
        double c=10;
        Double d=c;///自动装箱
        System.out.println("--------------------");
        Integer is=23;
        String rs=is.toString();
        System.out.println(rs+1);
        System.out.println(is+" 1");
        System.out.println("---------转整数-----------------");
        String number="23";
        int age=Integer.parseInt(number);
        System.out.println(age+1);
        int age1=Integer.valueOf(number);
        System.out.println(age1+10);
        String num="99.9";
        System.out.println(Double.valueOf(num)+0.1);
    }
}

package regularexpression_;

public class reges1 {
    public static void main(String[] args) {
        System.out.println("a".matches("[abc]"));
        System.out.println("a".matches("[bcd]"));
        System.out.println("a".matches("[^bcd]"));
        System.out.println("a".matches("\d"));
        System.out.println("3".matches("\d"));
        System.out.println("333".matches("\d"));
        System.out.println("z".matches("\w"));
        System.out.println("zz".matches("\w"));
        System.out.println("你".matches("\w"));
        System.out.println("你".matches("\W"));
        System.out.println("-----------一下是多字符的校验-------------");
        System.out.println("1231312231".matches("\w{6,}"));
        System.out.println("1231".matches("\w{6,}"));
        System.out.println("1231".matches("{6,}\w"));error
        System.out.println("23df".matches("[a-zA-Z0-9]{4}"));
        System.out.println("23_f".matches("[a-zA-Z0-9]{4}"));
        System.out.println("23df".matches("[\w&&[^_]]{4}"));
        System.out.println("23_f".matches("[\w&&[^_]]{4}"));
    }
}