Extracting specific data from a web page using PHP

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HTML Scraping in Php

I would like to know if is there any way to get from a webpage a specific string of text wich is updated every now and then using PHP. I´ve searched "all over the internet" and have found nothing. Just saw that preg_match could do it, but I didn't understand how to use it.

imagine that a webpage contains this:

<div name="changeable_text">**GET THIS TEXT**</div>

How can I do it using PHP, after having used file_get_contents to put the page in a variable?

Thanks in advance :)

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