find & replace when substr does not contain $id??

[lfernando]

Hello RegExperts!

 

I hope this makes sense and you guys can help me out.

 

I have a few db entries which that look like this:

$id=123
$string= 
"<li id=123_test_[1]>
<li id=123_test_[4]>
<li id=567_test_[9]>
<li id=123_test_[6]>
"

 

All ids in the list items should start with the $id.

I need a script that will find the list items that do not start with the $id, and replaces whichever number is there with the $id.

 

So the string above should look like this

 

$id=123
$string= 
"<li id=123_test_[1]>
<li id=123_test_[4]>
<li id=123_test_[9]>
<li id=123_test_[6]>
"

 

 

Thanks everyone!!

[Psycho]

Rather than try and "find" the ones that don't match, it would be easier to just replace ALL the ids with the $id you want.

$id = '123';
$string1 = "<li id=123_test_[1]>
<li id=123_test_[4]>
<li id=567_test_[9]>
<li id=123_test_[6]>";

echo preg_replace("#id=\d+_#", "id={$id}_", $string1);

 

Ouput:

<li id=123_test_[1]>
<li id=123_test_[4]>
<li id=123_test_[9]>
<li id=123_test_[6]>