copy a specific part of string php

Question

How can I get a part of a string from the specific starting position to end. Like for example I want to copy B000ROAQ30 from the given url:

www.amazon.com/Black-Nokia-HS-47-Stereo-Headset/dp/B000ROAQ30/ref=pd_sim_hi_4

This B000ROAQ30 part can occour anywhere in the URL like in this case:

www.amazon.com/abc/cdfg/hij/dp/B000ROAQ30/ref=pd_sim_hi_4

How can I copy this B000ROAQ30?

Note B000ROAQ30 can be different but having B00 at the start.

Please ask questions if anything is not clear.

Answer 1

This should work:

$url = 'www.amazon.com/Black-Nokia-HS-47-Stereo-Headset/dp/B000ROAQ30/ref=pd_sim_hi_4';
preg_match('/B00[0-9A-Z]+/', $url, $matches);

$result = $matches[0];

$result in this case will be: B000ROAQ30. Check it here: http://ideone.com/XrjIG