Question

How to extract the first 4 characters of a string using regex in Java

Answer 1

import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class MyClass {
    public static void main(String[] args)
    {
        Pattern pattern = Pattern.compile("^.{4}");
        String str = "programming with java";
        Matcher matcher = pattern.matcher(str);
        
        String substring = "";
        
        if (matcher.find()) {
            substring = matcher.group();
        }
        
        System.out.print(substring);
    }
}
 
 
 
/*
run:
 
prog
 
*/

 

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