Regex: Find ID in HTML element

Question

I want to get the oID parameter from this HTML source with a regex condition:

<img src="button_print.gif" style="cursor:hand" onclick="window.open('http://domain.com/print_order.php?oID=5', 'popup', 'toolbar=0, width=640, height=600')">

I´ve tried many different ways now but I´m unable to find the right way. For my understanding this regex should work (but it doesn´t):

oID=(\d+)

Maybe somebody has a hint for me?

It works for me. [reFiddle example](http://refiddle.com/h4k) — BackSlash, Feb 06 '14 at 13:14
[Don't try to parse HTML with regex](http://stackoverflow.com/a/1732454/2846923). — The Guy with The Hat, Feb 06 '14 at 13:18
@RyanCarlson He isn't trying to parse HTML with regex. He's trying to retrieve a URL parameter — BackSlash, Feb 06 '14 at 13:19
@BackSlash You're right, still I'd prefer extracting `onclick` value first. — raina77ow, Feb 06 '14 at 13:23
@raina77ow Of course. But in my personal opinion, I think there is no need to use a HTML-parsing library just for one string — BackSlash, Feb 06 '14 at 13:31
Yeah, seems to be a logical problem for me with regex_replace. This replace shoudl simply give me the ID: $string = ''; var_dump(preg_replace('/oID=(\d+)/','Output: $1',$string)); — Michael, Feb 06 '14 at 13:43

score 1 · Accepted Answer · answered Feb 06 '14 at 13:54

You have to replace the string before and after the match too:

.*?oID=(\d+).*

The command:

$string = '<img src="button_print.gif" style="cursor:hand" onclick="window.open(\'domain.com/print_order.php?oID=5\', \'popup\', \'toolbar=0, width=640, height=600\')">'; 
var_dump(preg_replace('/.*?oID=(\d+).*/','Output: $1',$string));

The result:

Output: 5

Online test.

Regex: Find ID in HTML element

1 Answers1