Databases
StackOverflow2013
Usersdbo
USSmarties89
 

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    1. COIf you program your javascript correctly, short answer yes. I a regex validation of usernames on my site, which makes it impossible to send a request for making a new user unless it is validated correctly. If I get a request which does not validate on the server, it is highly likely that the person has a malicious purpose. And I just send back a header, saying the server made some unintentional error(like it was a coding error). This is of course not the only security you should have, but it helps keeping lot of script kiddies at bay, by let them search for a hole, there simply isn't at there.
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    2. COWhat I find is good pratice is to: 1. Validate in the browser 2. Validate on the server with the exact same regex. If it fails, you know it is a person of malicious interest, and that you should log it. Beside that throw a internal server error, so the person will think he caused something to happen. It will waste lot of his/hers time.
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    3. COYes Blackcat, that is the purpose of try, except. Because you can continue executing the normal code, you have to do some error handling. If it is a minor error and you want to continue, you should use tryParse as JRC says. So example if I write "q" in, and you just want to replace my value by 0, you could do a tryParse, if it fails then just set the value to 0.
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