public class ClassPathResource { 
  public static boolean isMobileNO(String mobiles) { 
    Pattern p = Pattern 
        .compile("^(([-])|([^,//D])|([,-]))//d{}$"); 
    Matcher m = p.matcher(mobiles); 
    System.out.println(m.matches() + "---"); 
    return m.matches(); 
  } 
  public static void main(String[] args) throws IOException { 
    System.out.println(ClassPathResource.isMobileNO("")); 
  } 
}
public class ClassPathResource {  
  public static boolean isMobileNO(String mobiles) {  
    Pattern p = Pattern  
        .compile("^(([-])|([^,//D])|([,-]))//d{}$");  
    Matcher m = p.matcher(mobiles);  
    System.out.println(m.matches() + "---");  
    return m.matches();  
  }  
  public static void main(String[] args) throws IOException {  
    System.out.println(ClassPathResource.isMobileNO(""));  
  }  
} 

public static boolean isEmail(String strEmail) {  
  String strPattern = "^[a-zA-Z][\\w\\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\\w\\.-]*[a-zA-Z0-9]\\.[a-zA-Z][a-zA-Z\\.]*[a-zA-Z]$"; 
  Pattern p = Pattern.compile(strPattern); 
  Matcher m = p.matcher(strEmail); 
  return m.matches(); 
} 
public static boolean isEmail(String strEmail) {  
  String strPattern = "^[a-zA-Z][\\w\\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\\w\\.-]*[a-zA-Z0-9]\\.[a-zA-Z][a-zA-Z\\.]*[a-zA-Z]$";  
  Pattern p = Pattern.compile(strPattern);  
  Matcher m = p.matcher(strEmail);  
  return m.matches();  
}

import Android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button;
import android.widget.EditText;  
public class Main extends Activity { 
  private EditText editText; 
  private Button button; 
  
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    editText = (EditText) findViewById(R.id.textId); 
    editText.setText("EditText element"); 
    button = (Button) findViewById(R.id.btnId); 
    button.setText("Check"); 
    button.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
        if (checkString(editText.getText().toString())) { 
          editText.setText("Corect"); 
        } 
      } 
    }); 
  } 
  
  private boolean checkString(String s) { 
    return s.matches("\\w*[.](Java|cpp|class)"); 
  } 
}
import Android.app.Activity;  
import android.os.Bundle;  
import android.view.View;  
import android.widget.Button;  
import android.widget.EditText;  
public class Main extends Activity {  
  private EditText editText;  
  private Button button;  
  
  @Override 
  public void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.main);  
    editText = (EditText) findViewById(R.id.textId);  
    editText.setText("EditText element");  
    button = (Button) findViewById(R.id.btnId);  
    button.setText("Check");  
    button.setOnClickListener(new View.OnClickListener() {  
      @Override 
      public void onClick(View v) {  
        if (checkString(editText.getText().toString())) {  
          editText.setText("Corect");  
        }  
      }  
    });  
  }  
  
  private boolean checkString(String s) {  
    return s.matches("\\w*[.](Java|cpp|class)");  
  }  
}