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PHP preg_replace .*?

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Hey everyone. I would like to know how to use preg_replace to make it return anything in between
<!-- DESC --> ..some words and <!-- /DESC -->
. Like for example I have a document and it contains
<!-- DESC -->Welcome, this is a test <!-- /DESC -->
I want my function to return Welcome, this is a test. How would I do this? Thanks in advance.

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Alright. I'll show you with single strings since that's the simplest. It's not hard to extend it to using arrays for the search string and the replace string.

// I assume you're getting your string from a file. It doesnt really matter
$f = fopen('your_file', 'r');
$text = fread($f, filesize('your_file'));

// What this does is searches for the entire block for your DESC tag
// The inside of the block is put in parentheses so that I can backreference
// it in the replacement. The $1 is the reference to everything in the parentheses
$new_text = preg_replace('/<!-- DESC -->(.*)<!-- \/DESC -->/', '$1', $text);

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