add by hzwy23 IsDate check if the string is date ,the formatter support 2006-01-02 or 2006/01/02.

add by hzwy23 IsEmpty check if the string contains any character, but spacing is invalid.

check if string str is a member of the set of strings params.

add by hzwy23 IsMobilePhone check if the str is mobile phone number.

add by hzwy23 IsURI check if the string is URI address, relation address and absolute address is valid.

add by hzwy23 IsWord check if the string contains letters and numbers.