How to match the beginning of the input using Java RegEx?

Java Object Oriented Programming Programming

You can match the beginning of the input using the meta character “\\A”.

Example

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 = "\\A[0-9]";
      //Compiling the regular expression
      Pattern pattern = Pattern.compile(regex);
      //Retrieving the matcher object
      Matcher matcher = pattern.matcher(input);
      int count = 0;
      if(matcher.find()) {
         System.out.println("Match found ");
      } else {
         System.out.println("Match not found ");
      }
   }
}

Output 1

Enter a String
12 sample text
Match found

Output 2

Enter a String
sample text
Match not found

Krishna Kasyap

Published on 19-Nov-2019 08:00:13

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