I am trying to validate user input so it contains only letters, numbers, 
underscores and dashes. I am using this regexp:/[A-Z0-9_-]/. However, 
when I type in 'hello' in the field, it says that it doesn't match the 
regexp, yet I'm sure that reg exp works for letters, numbers, and 
underscores only. What am I doing wrong? Thanks for your help and time.

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