I am querying the db using a -unique id that is being passed through the query string (see previous thread titled "IN operator"). I'm validating the data using a regular expression in PHP before I pass it along. My case insensitive regex is currently "^[a-z0-9]{15,16}$". Does 15-16 alphanumeric characters cover all possibilities of a unique id hash?
unique hash format
unique hash format
Looks good. Thanks for the quick response!