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How to match digits using Java Regular Expression (RegEx)
You can match digits in a given string using the meta character "\d" or by using the following expression :
[0-9]
Example 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String args[]) {
//Reading String from user
System.out.println("Enter a String");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
String regex = "\d";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
}
System.out.println("Number of digits: "+count);
}
}Output
Enter a String sample text 1234 6657 Number of digits: 8
Example 2
import java.util.Scanner;
public class RegexExample {
public static void main( String args[] ) {
//regular expression to accept 10 digits
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("10 digit number");
} else {
System.out.println("wrong input");
}
}
}Output 1
Enter input value: 9848022558 10 digit number
Output 2
Enter input value: 5337 wrong input
Updated on: 19-Nov-2019
2K+ Views
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