How to use regular expressions with TestNG?

We use regular expressions in TestNG to work with a group of test methods that are named with a certain pattern.

Example

Testng xml file.

All the test methods with starting name Payment will be excluded from the regression suite.

Example

@Test
public void PaymentHistory(){
   System.out.println("Payment history validation is successful”);
}
@Test
public void Login(){
   System.out.println("Login is successful”);
}
@Test
public void PaymentDefault(){
   System.out.println("Payment default verification is successful”);
}

Login() will be executed, but all the methods starting with name Payment will be excluded from execution. This is achieved using regular expression(Payment.*).