Java regex validate number

by

Regular expression to accept only digits

\d+$

This regular expression refers to a pattern which accepts only digits.

Example

package com.w3schools;
 
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class RegexTest {
	private static final String PATTERN = "\d+$";
	public static void main(String args[]){ 
		List<String> values = new ArrayList<String>();	       
		values.add("Jai"); 
		values.add("12345345"); 
		values.add("1234567890");
 
		Pattern pattern = Pattern.compile(PATTERN);
		for (String value : values){
		  Matcher matcher = pattern.matcher(value);
		  System.out.println(matcher.matches());
		}
	}
}

Output

false
true
true