Question

Problem:

I need to confirm that iframe have one type of link with the following format:

http://www.example.com/embed/*****11 CHARACTERS MAX.****?rel=0

Starts with: http://www.example.com/embed/
Ends with: ?rel=0
11 CHARACTERS MAX. means in this spot, there can any 11 characters. Don't go beyond 11.

NOTE: none of the specified tags are ensured to be in every post. It depends on how user uses the editor.

I’m using PHP

---

I used the line below to make sure all tags are excluded except the ones specified:

$rtxt_offer = preg_replace('#<(?!/?(u|br|iframe)\b)[^>]+>#', '', $rtxt_offer);

Answer 1

You wrote you only want to validate the link value with a regular expression:

$doesMatch = preg_match('~^http://www.example.com/embed/[^?]{0,11}\?rel=0$~', $link);

This does specifically what you’re asking for.

For removing tags please see strip_tags or use a HTML parser to do it, which will also help you to get the link value more properly.

In a similar question/answer I posted some example code how to use strip_tags and SimpleXMLElement together: Extract all the text and img tags from HTML in PHP.