preg_replace everything but 0-9

Freakish_05 · 21 Jul 2007 at 22:26

Hi All,

Totally stumped on this one.

I'm trying to remove everything except the numeric digits used in 3 URL variables that I'm using in my blog system. I can't seem to grasp the whole regex thing :confused:

what do I need to put in there to exclude everything but 0-9?

Now that I think about it, these values will only be used in SELECT queries so I'm debating whether I need to secure them. Still, better safe than sorry. No?

As usual, all comments greatly appreciated.
Freakish_05

marc2003 · 21 Jul 2007 at 22:38

Code:

$string = preg_replace('/[^0-9]/i', '', $string);

i think that should do it.

meghatronic · 21 Jul 2007 at 22:39

marc2003 said:
Code:

$string = preg_replace('/[^0-9]/i', '', $string);

i think that should do it.

Yup yup, I came up with the same

Reg exp.. is there anything as horrible/useful combined?

Freakish_05 · 21 Jul 2007 at 22:49

Brilliant!

Thanks guys!

Freakish_05

psyr33n · 22 Jul 2007 at 00:59

String functions are generally faster than regex functions:

Code:

<?php

$string = 'My name is Alan; some call m3 4L4N. H3YL0 LAWL!!';

$numbers = array();
for($i = 0; $i <= 9; $i++)
 $numbers[] = $i;

$string = str_replace($numbers, '', $string);
echo $string;

?>

Dj_Jestar · 22 Jul 2007 at 15:59

you don't need case insensitive for numbers

psyr33n · 22 Jul 2007 at 16:45

Haha, right on. Edited.

marc2003 · 23 Jul 2007 at 22:56

psyr33n said:
String functions are generally faster than regex functions:

Code:

<snip>

isn't that going to replace the numbers with nothing and leave all other characters intact.... completely the opposite of the OP's requirement?

meghatronic · 24 Jul 2007 at 00:25

marc2003 said:
isn't that going to replace the numbers with nothing and leave all other characters intact.... completely the opposite of the OP's requirement?

lmao.

Yes it will!