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