Java正则表达式程序，用于匹配括号'('或者')'

"^.*[\(\)].*$";

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class SampleTest {
   public static void main( String args[] ) {
      String regex = "^.*[\(\)].*$";
      //Reading input from user
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter data: ");
      String input = sc.nextLine();
      //Instantiating the Pattern class
      Pattern pattern = Pattern.compile(regex);
      //Instantiating the Matcher class
      Matcher matcher = pattern.matcher(input);
      //verifying whether a match occurred
      if(matcher.find()) {
         System.out.println("Input accepted");
      }else {
         System.out.println("Not accepted");
      }
   }
}

Enter data:
sample(text) with parenthesis
Input accepted

Enter data:
sample text
Not accepted

import java.util.Scanner;
public class Example {
   public static void main(String args[]) {
      //Reading String from user
      System.out.println("Enter email address: ");
      Scanner sc = new Scanner(System.in);
      String e_mail = sc.nextLine();
      //Regular expression
      String regex = "^.*[\(\)].*$";
      boolean result = e_mail.matches(regex);
      if(result) {
         System.out.println("Valid match");
      } else {
         System.out.println("Invalid match");
      }
   }
}

Enter email address:
sample(text) with parenthesis
Valid match

Enter email address:
sample text
Invalid match