CODEWITHSUNDEEP
java
Udaya Kumar
Udaya Kumar

Reputation: 29

Masking Email address along with domain using regex

The requirement is as below:

Input: [email protected]
Output: r****i@*****.com

I tried below two regex's but I could not able to mask the gmail(domain name). Kindly help me on this.

String masked_email_Address2=email_Address.replaceAll("(?<=.{1}).(?=[^@]*?.@)", "*");

Output received as r****[email protected]

I searched in stack overflow on this, I got the below regex but it does not produce the correct result:

String masked_email_Address1=email_Address.replaceAll("\\b(\\w)[^@]+@\\S+(\\.[^\\s.]+)", "$1***@****$2");

Output received as: r***@****.com -- One star(*) is missed between R&@.

Upvotes: 2

Views: 3466

Answers (3)

Twaha Mehmood
Twaha Mehmood

Reputation: 737

Try this:

int idx = email_Address.indexOf('@');
 String part1 = email_Address.substring(1, idx-1).replaceAll(".", "\\*");
 String part2 = email_Address.substring(idx + 1, email_Address.lastIndexOf('.')).replaceAll(".", "\\*");

 String masked_email_Address1=email_Address.replaceAll("^(\\S)[^@]+(\\S)@.*(\\..*)", "$1"+ part1 + "$2@" + part2 + "$3");

Upvotes: 0

dpr
dpr

Reputation: 10964

How about:

String masked_email_Address2=email_Address.replaceAll("(.)?[^@]*([^@])@\\S+(\\.[^\\s.]+)?", "$1****$2@****$3");

This will work as long as your address is longer than 1 character long.

Upvotes: 0

Tim Biegeleisen
Tim Biegeleisen

Reputation: 520948

I started out trying to do this with a one-liner using String#replaceAll as you were doing, but then gave up, because variable length lookbehinds are not supported, and I could not come up with a pattern which did not use them.

Instead, try just using a format pattern matcher:

String email = "[email protected]";
String pattern = "([^@]+)@(.*)\\.(.*)";

Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(email);
if (m.find( )) {
    StringBuilder sb = new StringBuilder("");
    sb.append(m.group(1).charAt(0));
    sb.append(m.group(1).substring(1).replaceAll(".", "*"));
    sb.append("@");
    sb.append(m.group(2).replaceAll(".", "*"));
    sb.append(".").append(m.group(3));
    System.out.println(sb);
}

enter image description here

Demo

This may look like a lot of code to do a relatively small formatting job on an email address. If you like, you may put this code into utility method, and then you can still get the masking effect with a single line of code, when you call the method.

Upvotes: 2

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