Replace

[cosminb]

Here is what I want to do.
I have a string:
$string='The cat drunk my milk.The Milk ....';
What I want to do is replace 'milk' and 'Milk' with '<b>milk</b>'.
Also I want to replace 'MILK', 'MILk', 'MIlk' ... if they are in my string. But at the same time I want to keep the case of each letter. Meaning that if i find 'milk' in my string I want to replace it with '<b>milk</b>' and if I find 'miLK' I want to replace it with '<b>miLK</b>'

I'm just starting to learn about regular expression and I don't know how to this ... so
can somebody show me how to do this, or maybe give me a link to a good regular expression tutorial

thanks

[laserlight]

I think this will work:

<?php
$string = 'The cat drunk my milk.The Milk ....';
$string = preg_replace("/(milk)/i", "<b>\$1</b>", $string);
echo $string;
?>

This is the first time I'm using a back-reference, but I tested and it seemed to work.

[laserlight]

The guide on regex that I learnt from is:
http://etext.lib.virginia.edu/helpsheets/regex.html

[cosminb]

It works very well

Thank you very much laserlight !!!

[laserlight]

No problem, I wrote it offhand and it worked, my regex must be getting better, lol 😃