preg_match help

if I have this info in a doc

" id="r4_20770702">

how would I use preg_match or preg_match_all to parse ot the number 20770702

and would it be different to parse ot more than one id in that form like...

" id="r4_20770702">
" id="r4_35133964">
" id="r4_38461866">
" id="r4_31859736">

Assuming r4_ is always there, then this might work:

preg_match_all('/id="r4_([\d]+)">/', $string, $matches);
print_r($matches[1]);

Other variations depending on the formats.

yep r4 is the same all the time, Thanks man! I aqppreciate the help, it worked

I need to learn preg match.. It would help out alot for the stuff I do, any tips?

This is a good source:  http://www.regular-expressions.info/

Also, there are quite a few online regex testers:  http://www.myregextester.com/index.php

couple things to note about the pattern AbraCadaver provided:

preg_match_all('/id="r4_([\d]+)">/', $string, $matches);

\d doesn't have to be wrapped in a character class, it's kind of it's own character class, so you can just do \d+ 

But \d technically matches more than numbers, so if you want to be more specific, use [0-9] instead:

preg_match_all('/id="r4_([0-9]+)">/', $string, $matches);