[PHP] help with preg_match

[Anders Thoresson]

Hi,

I'm trying to write a function that validates the input in a textarea. I just want to allow alphanumrical characters, and if the user enters anything else, I display an error message by calling error().

But the following doesn't work. Even if I enter "hello" in the textarea, I get the error message. What am I missing?


// validate entered text in textarea

function validate_textarea($unchecked_text) {

if (!preg_match ("/^[a-zåäö0-9]$/is", $unchecked_text)) {
error("You have used unlegal characters, just alphanumeric is ok.");
}
}

Best regards,

Anders


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