How to hide phone number by masking it?

Question

I'm trying to hide phone no by masking it, I found this but it doesn't really fulfill the need.

Question:

if I have phone no 0123456789, how to mask to 0XXXXXXXX9?

Answer 1

HI @Dondon510 ,

You can try this simple way.

str.substring(0, 5) +  
                str.substring(5, str.length() - 3)  
                .replaceAll("[\\d]", "x") +  
                str.substring(str.length() - 3, str.length());  

https://stackoverflow.com/questions/31000039/mask-all-digits-except-first-6-and-last-4-digits-of-a-string-length-varies