online compiler and debugger for c/c++

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/****************************************************************************** Welcome to GDB Online. GDB online is an online compiler and debugger tool for C, C++, Python, Java, PHP, Ruby, Perl, C#, VB, Swift, Pascal, Fortran, Haskell, Objective-C, Assembly, HTML, CSS, JS, SQLite, Prolog. Code, Compile, Run and Debug online from anywhere in world. *******************************************************************************/ import java.util.regex.Matcher; import java.util.regex.Pattern; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner entrada = new Scanner(System.in); System.out.println("Ingresa tu correo electronico"); String correo = entrada.nextLine(); Pattern pattern = Pattern.compile("^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}$", Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(correo); boolean matchFound = matcher.find(); if(matchFound) { String user = correo.split("@")[0]; System.out.println(user); } else { System.out.println("Correo no válido"); } } }

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