Regex to prevent XSS attack in json string

Question

I'm performing input validation in java using ESAPI.validator().getValidInput method call to prevent XSS attacks in POST requests.

I am sending my json string to this method to validate against a regex.

My ESAPI regex is as follows:

    Validator.SafeStringSpcCharacters=(?u)^[.\\p{Alnum}\\p{Space}*,()&+!@#$%^_={}:";'?~`|\\[\\]\\\\\/-]{0,2147483647}$

Please advice for a valid regex to prevent XSS attacks in json string.