Java Regular Expression

Some useful java function that may help me in the java project

• Convert List of integer into any literal separated string

public static String joinList(List<Integer> list, String literal) {
    return list.toString().replaceAll(",", literal).replaceAll("[\\[.\\].\\s+]", "");
}

• Generate random number of 10 digits

public static String randomNumber(){
      Long randomNumber =  (long) Math.floor(Math.random() * 9000000000L) + 1000000000L;
      String number = Long.toString(randomNumber);
      return number;
}

• Get Current date into the specified format

public static String currentDate(String dateFormat){
      SimpleDateFormat s = new SimpleDateFormat(dateFormat);  
      Calendar cal = Calendar.getInstance();  
      return s.format(new Date(cal.getTimeInMillis()));
}
 

• Check given input string is numeric or not

public static boolean isNumeric(String inputString) {
      return inputString.matches("[-+]?\\d*\\.?\\d+");
}

• Check given input string is alphabetic or not

public static boolean isAlphabetic(String inputString) {
      return inputString.matches("[a-zA-Z]+");
}

• Regular expression to validate email address

public static boolean isEmailFormat(String inputString) {
      return inputString.matches("^[\\w!#$%&'*+/=?`{|}~^-]+(?:\\.[\\w!#$%&'*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$");
}

• Regular expression to validate alphanumeric string

public static boolean isAlphaNumeric(String inputString) {
      return inputString.matches("^[a-zA-Z0-9\\s]*$");
}