도 1을 참조하면, 소정의 문자 클래스
-
모든 문자
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\ D 수치 [0-9]
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\ D 비 수치 [^ 0-9]
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\ S 공백 : \ t \ n \ X0B \ F \ R]
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\ 비 공백 문자 S : [^ \ s]에
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\ W 단어 문자 [A-ZA-Z_0-9]
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\ W 비 단어 문자 [^ \ w]
2, 코드
public class Demo3_Regex {
/**
* . 任何字符
\d 数字：[0-9]
\D 非数字： [^0-9]
\s 空白字符：[ \t\n\x0B\f\r]
\S 非空白字符：[^\s]
\w 单词字符：[a-zA-Z_0-9]
\W 非单词字符：[^\w]
*/
public static void main(String[] args) {
//demo1();
//demo2();
//demo3();
//demo4();
//demo5();
//demo6();
String regex = "\\W";
System.out.println("a".matches(regex));
System.out.println("z".matches(regex));
System.out.println("_".matches(regex));
System.out.println("%".matches(regex));
}
private static void demo6() {
String regex = "\\w";
System.out.println("a".matches(regex));
System.out.println("z".matches(regex));
System.out.println("_".matches(regex));
System.out.println("%".matches(regex));
}
private static void demo5() {
String regex = "\\S";
System.out.println(" ".matches(regex));
System.out.println(" ".matches(regex));
System.out.println("a".matches(regex));
}
private static void demo4() {
String regex = "\\s";
System.out.println(" ".matches(regex));
System.out.println(" ".matches(regex)); //一个tab键
System.out.println(" ".matches(regex)); //四个空格
}
private static void demo3() {
String regex = "\\D";
System.out.println("0".matches(regex));
System.out.println("9".matches(regex));
System.out.println("a".matches(regex));
}
private static void demo2() {
String regex = "\\d"; //\代表转义字符,如果想表示\d的话,需要\\d
System.out.println("0".matches(regex));
System.out.println("a".matches(regex));
System.out.println("9".matches(regex));
}
private static void demo1() {
String regex = "..";
System.out.println("a".matches(regex));
System.out.println("ab".matches(regex));
}
}
3. 결과
