How about this 
if ((length($contents) > 0) && ($contents !~ /^[\w \.\,\=\" \/<>]+$/))
+{
$contentserror = "Error - message.";++$error;
}

[download]
Also != should probably be !~.

- Tom

In reply to Re: Allow empty form fields regex by tcf22
in thread Allow empty form fields regex by Hissingsid

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