Need help with regular expression for Name validations

Hi All,

I need a regular expression with following requirements for Name validations.

1. Name should contains atleast one alphabets.

2. It may contains period, hyphen, apostraphe and space( may be multiple but not consecutive).

Eg:

Valid Strings: 

test

t.te-test test

test-test'test.test, .test

Invalid strings:

test......test

-.

test----test

I tried with below one, but no luck.

^(?!.*(.)\1)[\s.'-]*[a-zA-Z].*$

Thanks in Advance.