Java: Check a string starts with a specific number or not

Last update on May 24 2025 12:59:03 (UTC/GMT +8 hours)

9. String Starts with Specific Number

Write a Java program where a string starts with a specific number.

Sample Solution:

Java Code:

import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class test {
 
   public static void main(String[] args) {
	   
	    System.out.println(validate("5-2345861"));
		System.out.println(validate("6-2345861"));
		System.out.println(validate("6-5555861"));
        }

   public static String validate(String text) {
	    Pattern pattern = Pattern.compile("^5.*$");
		 Matcher m = pattern.matcher(text);
		
	   if (m.find())
                return "Found a match!";
       else
                return "Not matched!";
   }
}

Sample Output:

Found a match!
Not matched!
Not matched!

Flowchart :

For more Practice: Solve these Related Problems:

• Write a Java program to check if a string begins with a specified digit using regex anchoring.
• Write a Java program to extract the starting numeric character from a string and validate it against a given value.
• Write a Java program to implement a method that returns true if the first character of a string is a digit matching a target.
• Write a Java program to validate multiple strings to determine if they start with a number within a specified range.

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