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a regex question


Buyocat

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I'm trying to do a really simple regular expression, but it doesn't seem to be working.  I want to check that  a string contains only numbers, letters and the "_.-" characters.  (Obviously they don't have to be in a string like that)  Anyway here is what I have created, the problem it is it never evaluates properly -- it just evaluates to false regardless of what I feed it.

[code]
$pattern = '[^a-zA-Z0-9_.-]{6,}'; // I want it to be at least 6 characters in length
$string = 'helloworld'; // pick any string you want
if (eregi($pattern, $string)) echo 'true';
else echo 'false'; // it is only echoing false
[/code]
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