/^[A-Z0-9_]*$/i is a regular expression.
Basically
^ denotes starts with
[A-Z0-9_]* denotes 0 or more capitals, numbers and underscores
$ denotes ends_with
The i at the end means to ignore case (i think).
Thus your username can only contain letters, numbers and underscores
and nothing else.
The regular expression is contained between the //
If you were wanting to do this in a javascript function you will have
to investigate using regular expressions in javascript.
The syntax should be the same for the actual regular expression.
On Dec 10, 12:24 pm, David <[EMAIL PROTECTED]> wrote:
> 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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