解释Java正则表达式中的量词
如果要在构造正则表达式时指定出现次数，则可以使用量词。下表列出了Java正则表达式支持的量词-
示例
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main( String args[] ) {
String regex = "[0-9]{3,6}";
Scanner sc = new Scanner(System.in);
System.out.println("Enter 5 input strings: ");
String input[] = new String[5];
for (int i=0; i<5; i++) {
input[i] = sc.nextLine();
}
//创建一个Pattern对象
Pattern p = Pattern.compile(regex);
System.out.println("Matched values: ");
for(int i=0; i<5;i++) {
//创建一个Matcher对象
Matcher m = p.matcher(input[i]);
if(m.matches()) {
System.out.println(m.group()+": accepted ");
}
}
}
}输出结果
Enter 5 input strings: 12 154 4587 478365 4578952 Matched values: 154: accepted 4587: accepted 478365: accepted