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Thread ID: 60179 2005-07-25 05:03:00 php string validation check [A-z0-9_-] Morgenmuffel (187) Press F1
Post ID Timestamp Content User
375125 2005-07-25 05:03:00 Hey all,

I am trying to write afunction to test that a username is valid and only contains
alphanumeric characters and the underscore character
as below



<?php
function isUsername($element) {
return !preg_match ("/[A-z0-9_-]/", $element);
}
?>

But When i try entering a username like say 'nigel' (sans quotes of course) it returns a fail

any suggestions would be much appreciated 		Morgenmuffel (187)
375126 2005-07-25 05:17:00 Try:

<?php
function isUsername($element) {
return !preg_match ("/[a-zA-Z0-9_\-]/", $element);
}
?> 		vinref (6194)
375127 2005-07-25 05:33:00 nz.php.net mejobloggs (264)
375128 2005-07-25 06:32:00 well i am now officially lost,
for some reason vin refs suggestion doesn't work

<?php
function isUsername($element) {
return !preg_match ("/[a-zA-Z0-9_\-]/", $element);
}
?>

it makes sense, but I can't get it work

thanks for the other link mejoebloggs, I'll read through that to see if I can make a function that works so I understand it


must be a record for me
edit: 3


<?php
function isUsername($element) {
return !preg_match ("/[^A-z0-9_\-]/", $element);
}
?>

seems to work

Thanks all

If it fails I'll be back 		Morgenmuffel (187)
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