正则表达式---预定义字符类

最新推荐文章于 2025-03-08 22:39:59 发布

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最新推荐文章于 2025-03-08 22:39:59 发布

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分类专栏： Java 文章标签：预定义字符类

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正则表达式—预定义字符类

public class Demo3_Regex {

	public static void main(String[] args) {
		//demo1();
		//demo2();
		//demo3();
		//demo4();
		//demo5();
		//demo6();
		//demo7();
		
	}

	private static void demo7() {
		String regex = "\\W";					//\W 匹配非[a-zA-Z_0-9]中任何单个字符
		System.out.println("Z".matches(regex));
		System.out.println("a".matches(regex));
		System.out.println("1".matches(regex));
		System.out.println("_".matches(regex));
		System.out.println("#".matches(regex));
	}

	private static void demo6() {
		String regex = "\\w";					//\w 匹配[a-zA-Z_0-9]中任何单个字符
		System.out.println("Z".matches(regex));
		System.out.println("a".matches(regex));
		System.out.println("1".matches(regex));
		System.out.println("_".matches(regex));
		System.out.println("#".matches(regex));
	}

	private static void demo5() {
		String regex = "\\S";					//\S 匹配任何非空白字符
		System.out.println(" ".matches(regex));
		System.out.println("a".matches(regex));
	}

	private static void demo4() {
		String regex = "\\s";					//\s 匹配任何空白字符，包括空格、制表符、换页符
		System.out.println(" ".matches(regex));
		System.out.println("a".matches(regex));
	}

	private static void demo3() {
		String regex = "\\D";					//\表示转义字符，如果想表示\D的话，需要用\\D(非0-9的单个数字字符)
		System.out.println("3".matches(regex));
		System.out.println("a".matches(regex));
		System.out.println("%".matches(regex));
	}

	private static void demo2() {
		String regex = "\\d";					//\表示转义字符，如果想表示\d的话，需要用\\d(0-9的单个数字字符)
		System.out.println("3".matches(regex));
		System.out.println("a".matches(regex));
	}

	private static void demo1() {
		String regex = "..";					//匹配任意两个字符
		System.out.println("ac".matches(regex));
		System.out.println("a".matches(regex));
	}
	
}