How to replace string values with "XXXXX" in java?

Question

I want to replace particular string values with "XXXX". The issue is the pattern is very dynamic and it won't have a fixed pattern in input data.

My input data

https://internetbanking.abc.co.uk/personal/logon/login/?userId=Templ3108&password=Got1&reme

I need to replace the values of userId and password with "XXXX".

My output should be -

https://internetbanking.abc.co.uk/personal/logon/login/?userId=XXXX&password=XXXX&reme

This is an one off example. There are other cases where only userId and password is present -

userId=12345678&password=stackoverflow&rememberID=

I am using Regex in java to achieve the above, but have not been successful yet. Appreciate any guidance.

[&]([^\\/?&;]{0,})(userId=|password=)=[^&;]+|((?<=\\/)|(?<=\\?)|(?<=;))([^\\/?&;]{0,})(userId=|password=)=[^&]+|(?<=\\?)(userId=|password=)=[^&]+|(userId=|password=)=[^&]+

PS : I am not an expert in Regex. Also, please do let me know if there are any other alternatives to achieve this apart from Regex.

Answer 1

This may cover given both cases.

String maskUserNameAndPassword(String input) {
    return input.replaceAll("(userId|password)=[^&]+", "$1=XXXXX");
}

String inputUrl1 = 
    "https://internetbanking.abc.co.uk/personal/logon/login/?userId=Templ3108&password=Got1&reme";

String inputUrl2 = 
    "userId=12345678&password=stackoverflow&rememberID=";

String input = "https://internetbanking.abc.co.uk/personal/logon/login/?userId=Templ3108&password=Got1&reme";

String maskedUrl1 = maskUserNameAndPassword(inputUrl1);
System.out.println("Mask url1: " + maskUserNameAndPassword(inputUrl1));

String maskedUrl2 = maskUserNameAndPassword(inputUrl1);
System.out.println("Mask url2: " + maskUserNameAndPassword(inputUrl2));

Above will result:

Mask url1: https://internetbanking.abc.co.uk/personal/logon/login/?userId=XXXXX&password=XXXXX&reme
Mask url2: userId=XXXXX&password=XXXXX&rememberID=