Display only the numbers in a string

[papaface]

Hello,
Can someone please help me with the code below.
[code]ereg_replace("[[:alpha:]]", "", $string);[/code]
I want to allow ONLY numbers. This means i have to get rid of all special characters aswell such as <%*(£^", so i that i am just left with numbers e.g. 76445 :D

Thanks

[mansuang]

[code]
ereg_replace("[^0-9]", "", $string);
[/code]

More information regarding regular expression : http://en.wikipedia.org/wiki/Regular_expression

hope it helps

[papaface]

of course, how did i not see that.
Thanks!

[papaface]

actually how would i allow only numbers AND "," commas?
Ive tried
[code]ereg_replace("[^0-9][^,]", "", $string);[/code]
but that doesnt work.

[wildteen88]

add a comma after 0-9 in the character class, like so:

[code=php:0]$str = 'hello123,world256';

echo preg_replace("/[^0-9,]/", '', $str);
// returns 123,456[/code]