Method to verify if a string is legal base64 encoded

Util.java

	/**
	 * Check if valid BASE64 String.
	 * @param value
	 * @return
	 */
	public static boolean checkIfValidBase64(String value){
		return value.matches("^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$");
	}