[SOLVED] hide last digits of ip

[tyra]

How to hide last digits of ip adress if i take them from arry?

[RussellReal]

preg_replace("/\.\d{1,3}$/",'xxx','123.230.192.222');

[RussellReal]

preg_replace("/\.\d{1,3}$/",'.xxx','123.230.192.222');

 

sorry.. use this instead

[tyra]

Thanks!

But if i have that string longer than just ip then how can i find the end of it there?

each ind of the ip is -

 

[Ken2k7]

It should still work. What string do you have that the code is failing on or not producing the desired results/output?

[RussellReal]

<?php
echo preg_replace("/((?:[01]?\d\d?|2(?:[0-4]\d|5[0-5]))(?:\.(?:[01]?\d\d?|2(?:[0-4]\d|5[0-5]))){2})\.(?:[01]?\d\d?|2(?:[0-4]\d|5[0-5]))\b/",'$1.xxx','123.230.192.222');
?>

 

this works, just tested it

[tyra]

holy smokes!

That surely isn't something to keep in mind.

Can you explain a bit how did you came to this?

 

[RussellReal]

(?:[01]?\d\d?|2(?:[0-4]\d|5[0-5]))

 

this basically matches any number between 0 and 255, with the exception of like 001 which is also possible to see, akwardly enough, in an IP.

 

then, I attempt to match that same thing, but with a dot at the front, 2 times, since you just want to remove the last number.

 

(?:\.(?:[01]?\d\d?|2(?:[0-4]\d|5[0-5]))){2}

 

and then, the last one, is just another match from 0 - 255, with a word boundary expected \b to tell it to attempt all numbers, instead of match then exit

 

(?:[01]?\d\d?|2(?:[0-4]\d|5[0-5]))\b

 

the first 3 parts, I captured it in a backreference, then used it in the replacement $1.xxx, which translates in plain english, {First 3 Parts}.xxx

 

its regex, if you want to learn regex you should check out regexbuddy.com, they sell a product but they also give free regex tutorials.

 

goodluck tyra,

Russell