如何使用Java正则表达式(RegEx)匹配非数字
您可以使用元字符“\\D”匹配非数字字符。
例子1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String args[]) {
//从用户读取字符串
System.out.println("Enter a String");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
String regex = "\\D";
//编译正则表达式
Pattern pattern = Pattern.compile(regex);
//检索匹配器对象
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
}
System.out.println("Number non-digit characters: "+count);
}
}输出结果
Enter a String sample text 2425 36 Number non-digit characters: 13
例子2
import java.util.Scanner;
public class RegexExample {
public static void main( String args[] ) {
//正则表达式接受5个字母的单词
String regex = "\\D{10}";
System.out.println("Enter input value: ");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
boolean result = input.matches(regex);
if(result) {
System.out.println("input matched");
}
else {
System.out.println("wrong input");
}
}
}输出1
Enter input value: sample abc input matched
输出2
Enter input value: sample1234 wrong input