I am trying to write my own javascript validation and am looking for
some help with writing a function that checks to see if a string
contains invalid characters. I have gotten it to work for spaces:
username.include?(' ')
but I would like to perform a thorough check for all invalid
characters like my user validation:
validates_format_of :username, :with => /^[A-Z0-9_]*$/i
Im a little confused about the /^[A-Z0-9_]*$/i syntax. Can anyone
enlighten me?
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