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Filtering Input


N-Bomb(Nerd)

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Hello, I've never really been good at filtering user input. I guess I've never really tried to use it so much in fear of getting hacked or something. Anyways, I'm trying to make a script that will take a users input and create a directory on my sever from what they named it. However, how would I be able to run a "check" for all symbols/spaces/quotes? I don't want them to submit it and just have the script create the directory without something they put in the name of it.. so I kind of want it to scan for anything pretty much that isn't alpha-numeric with the exception of underscores. How would one accomplish such thing?

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