public class MainClass
{
public static void main( String[] args )
{
System.out.println(validateAddress("123, Street"));
}
// validate address
public static boolean validateAddress( String address )
{
return address.matches(
"\\d+\\s+([a-zA-Z]+|[a-zA-Z]+\\s[a-zA-Z]+)" );
} // end method validateAddress
}