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法律研究Java 中的正则表达式“D”元字符
子表达式/元字符“\D”用于匹配非数字。
示例 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
Number of matches: 24
示例 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();
}
//Creating a Pattern object
Pattern p = Pattern.compile(regex);
System.out.println("Number of non-digit characters in each string: ");
for(int i=0; i<5;i++) {
//Creating a Matcher object
Matcher m = p.matcher(input[i]);
int count = 0;
while(m.find()) {
count++;
}
System.out.println("String "+i+": "+count);
}
}
}输出
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
更新于： 19-11-2019
487 次浏览
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