ereg 0-9 and *

I must check a string which must contains

only numbers between 1 to 23 OR the "*" carachter

and the numbers must be integers from 1 to 23 .

( I need it to enter a cronjob via webform)

I did try several way for example

if (    (!ereg ('[0-9]', $hour) || ( $hour < 0 && $hour > 23) )  || $hour != "*"    ) {
echo "error";
}
else
{
echo "OK";
}

but it didn't work ..

Anyone can help me ?

Thanks

ok I found it

$hour="*";

if (    (!ereg ('[0-9]', $hour) || ( $hour < 0 && $hour > 23) ) && ( $hour != "*" )    )

{
echo "Error";
}
else
{
echo "ok";
}

no it doesn't work too 🙁
please help !!

...only numbers between 1 to 23 OR the "*" carachter

and the numbers must be integers from 1 to 23 .

use the same principal as from this thread.

i'm using 'ord()' and 'chr()' to check each character in a string and return only the one's wanted.