regular expression problem.HELP ME!

[Anon]

hello,

I DON'T WANT SPECIAL CHARACTERS e.g.?></|+=_-)*&^%$#@!~`
IN MY QUANTITY FIELD.HOW I CAN RESTRICT THE USER TO NOT ENETER THESE
CHARACTERS.
I AM TRYING IN THE FOLLOWING WAY BUT IT IS NOT WORKING.
CAN U PLZ HELP ME................
I REALLY NEED UR URGENT HELP!

<?php

if(ereg("[^{.]{1,}[-]{1,}[a-z]{1,}",$qty))}
{
echo(" valid quantity");
}

else{

echo("number is not integer");
}
?>

[skripty]

Rather than checking that the characters are not in $qty, why dont you just check that $qty is an integer?

[majik-sheff]

This will allow digits and optional commas, nothing else.

if (preg_match("/^{(\d,)(\d+)$/",} $qty)) {
echo("valid quantity");
} else {
echo("number is not integer");
}

[Anon]

Thanks a lot for your help.