Partially hiding an email address with PHP regex

Question

I have found two topics which at first appear to answer my query but they only seem to get me part-way to a solution. Using them I have got to where I am. So it's not a duplicate!

I want to replace all but the first character in the name part and domain part of an email address with an asterisk:

eg

g******@g****.com or g******@g****.co.uk

code:

$email2 = preg_replace('/(?<=.).(?=.*@)/', '*', $email);
$email3 = preg_replace('/(?<=@.)[a-zA-Z0-9-]*(?=(?:[.]|$))/', '*', $email2);

which is almost there but gives me g******@g*.com rather than g******@g*****.com

Can anyone help me with the regex please?

Graham if someone gave you the answer you are looking for, don't forget to accept that answer so people know the question is resolved. — Blizz, May 14 '15 at 10:04

anubhava · Accepted Answer · 2015-05-14T11:15:19.737

6

You can use:

$email = preg_replace('/(?:^|@).\K|\.[^@]*$(*SKIP)(*F)|.(?=.*?\.)/', '*', $email);

RegEx Demo

This will turn great@gmail.com into g*****@g*****.com and

myemail@gmail.co.uk will become m*******@g*****.co.uk

and test.test@gmail.com into t*********@g*****.com

edited May 14 '15 at 11:15

answered May 14 '15 at 09:40

anubhava

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vks · Answer 2 · 2015-05-14T09:55:21.483

0

^.\K|.(?=.*@)|@.\K|\..*(*SKIP)(*F)|.(?=.*\.)

You can try this.Replace by *.See demo.

https://regex101.com/r/mT0iE7/20

edited May 14 '15 at 09:55

answered May 14 '15 at 09:34

vks

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That's great. Thanks. I have been tearing my hair out trying to find a solution. – Greum May 14 '15 at 09:44
`myemail@gmail.co.uk` will be replaced by `m*******@g********.uk` I believe op wants to keep `m*******@g*****.co.uk` – anubhava May 14 '15 at 09:45
@anubhava thanx...updated :) – vks May 14 '15 at 09:48

Partially hiding an email address with PHP regex

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