PHP variable between 2 string positions - php

Question

I have tried searching the forums but still unsure how to do this.
I am extracting a web link from a webpage, and the start and end are always the same but there is a variable i want to get.
E.g http://www.example.com/images/$VARIABLE/image.jpg
$position1 = http://www.example.com/images/
$position2 = image.jpg
I need to get the variable. On the webpage the $position 2 is listed more than once (image.jpg)
I have tried all sorts of things and nothing works so far.
Thank you
$begin = strpos($page, $position1) + strlen($position1);
$end = strpos($page, $position2);
$ImageName = substr($page, $begin, ($end - $begin));

Answer 1

I think the problem is that if image.jpg occurs before http://www.example.com/images/, then just trying to use your code won't work.
A slight fix would be to start the search for $position2 where you found the first part by adding a start point in the strpos() function...
$begin = strpos($page, $position1) + strlen($position1);
$end = strpos($page, $position2, $begin);
$ImageName = substr($page, $begin, ($end - $begin) - 1);
with
$page = "some test image.jpg some more text
blurb that is in the middle http://www.example.com/images/VARIABLE/image.jpg
some even more text image.jpg";
the code finds
VARIABLE
A regex as suggested by #user3783243 may also work, but you may also need a constraint of how long the parameter is likely to be.