regex syntax problem

[robos99]

I've got the following regular expression pattern:
"^[0-9]+$"
to check if a string supplied is a number or not, but i keep getting warnings from php:
Warning: preg_match(): No ending delimiter

I'm kinda confused because isn't the $ the ending delimiter? Maybe I'm missing something.

[poirot]

The regex should be:
"/^[0-9]+$/" or "/^\d+$/"

You can also use typcasting and convert the value to a number, using (float) $var, (int) var, settype(), and so on

[code]<?php

echo $_GET['d'] . '<br />';
echo (preg_match("/^\d+$/", $_GET['d'])) ? 'true' : 'false';

?>[/code]