Java中的正则表达式“ \ D”元字符
子表达式/元字符“\D”与非数字匹配。
例子1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
public static void main( String args[] ) {
String regex = "\\D";
String input = "This is sample text 12 24 56 89 24";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(input);
int count = 0;
while(m.find()) {
count++;
}
System.out.println("Number of matches: "+count);
}
}输出结果
Number of matches: 24
例子2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
public static void main( String args[] ) {
String regex = "\\D";
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("Number of non-digit characters in each string: ");
for(int i=0; i<5;i++) {
//创建一个Matcher对象
Matcher m = p.matcher(input[i]);
int count = 0;
while(m.find()) {
count++;
}
System.out.println("String "+i+": "+count);
}
}
}输出结果
Enter 5 input strings: sample 1 12 35 36 63 test 243 663 hello hello how are you * Number of non-digit characters in each string: String 0: 7 String 1: 3 String 2: 6 String 3: 5 String 4: 19