Checking for all numbers in a string.

chads2k2

I have been searching and searching on this site and know I saw it once and can't find it again. 🙁 Here is what I am looking to do. I really don't understand regular expressions. However, I am working on it. Here is what I am trying to do.

Take a string like $match = "1a";
Now it contains a number so that's bad.

Take this string like $match = "123";
Now it contains all numbers so it's all good.

Basically if $match has ANYTHING other than numbers it just flips out and says no. I tried is_integer() but realized that's not what I am looking to do.

Thank you all,

Chad

devinemke

[man]is_numeric[/man]

chads2k2

Great thanks! Yeah that works but how would I go about writing a regular expression for it?

Chad

tekky

I believe its as simple as

if (eregi($string, '[^0-9]')) { echo 'Bad form!'; }

note: correction ^ goes inside the brackets

chads2k2

That didn't work but it's all good I need to move on my objective thank you both so much and have a good one!

Chad

Weedpacket

^[0-9]+$

or you can use trim() (hint: use the second argument to trim digits from the string).

laserlight

Actually, instead of overkill with regex, and using is_numeric() which accepts numbers in standard form, you might want to try [man]ctype_digit/man instead.

Installer

And here's another suggestion:

$strings = array('abc4ef', 'ghij', '0246', 'WXyz', '0fedc', '2cd', ':-)');
foreach ($strings as $value) {
    for ($i = 0; $i < strlen($value); $i++) {
        if (is_numeric($value{$i})) {
            echo '"' . $value . '" is bad' . '<br />';
            continue 2;
        }
    }
    echo '"' . $value . '" is good' . '<br />';
}

chads2k2

Laselight I had no idea of that function. Gosh there are just so many functions I have no idea about! Thanks for opening my eyes.

Installer,
That's cool thanks.