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

Java Regular Expression: Exercise-9 with Solution

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 :

Flowchart: Check a string starts with a specific number or not.

Java Code Editor:

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Java: Tips of the Day

Split Java String by New Line

String lines[] = string.split("\\r?\\n");

There's only really two newlines (UNIX and Windows) that you need to worry about.

Ref: https://bit.ly/3dHk7ip