Basically, you want to do a regular expression to see what characters are in
the username, and make none of them are illegal...
I currently have the rules of
5-30 characters
lowercase, numbers 0-9 and underscore (_) only
I achieve this with:
30) ) {
echo "username invalid -- must contain o
I'm having trouble when a user post a message to a MySQL database where if a
user create a user name like 'user&user' as the & symbol is used in URLs.
Does anyone have any idea how I can inform user that they have entered and
illegal character and are there are illegal characters that I should let
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