Removing single quotes for numeric value in string

Question

How to remove single quotes for numeric value in string(only for numerics, for alphabets it should not remove).

 

for eg.

 

(Last Name Between '200','200' AND (Zipcode = '0' AND Last Name Between 'test1','test2')) 

 

In a above eg. need to remove single quotes for 200 & 0 and not for test1 and test2.