preg_match a hyperlink

I looked everywhere for an answer, but it seems I cannot get my head around preg_match functionality. I want to preg_match the link below where only the numbers part (the ID) is dynamic.

Link:

http://video.cnbc.com/gallery/?video=3000024508

Here goes what I have come up until now:

preg_match( '/^http://video.cnbc.com/gallery/?video=([0-9_-]/', $content )

But it won't work.

 preg_match('#^http://video\.cnbc\.com/gallery/\?video=([0-9_-]+)$#', $content);

RegExr Demo

Besides problems that others mentioned (escaping the ? and . and using # instead of /) you are also missing a + from after the number group ([0-9_-]), which means that group can be repeated.

If you need to check if a string includes this kind of link or not, remove ^ and $:

preg_match('#http://video\.cnbc\.com/gallery/\?video=([0-9_-]+)#', $content);

Well, you're missing a close paren after [0-9_-] and you didn't escape properly. Use # instead of / and you'll get this:

preg_match( '#^http://video\.cnbc\.com/gallery/\?video=([0-9_-]+)#', $content )

You didn't escape it properly:

preg_match( '/^http:\/\/video.cnbc.com\/gallery\/\?video=([0-9_-])/', $content)

Here are the problem characters:

• / means start and end of regex, you were ending it after http:
• ? means the previous character is optional.

You also forgot a closing parenthesis.