> On Fri, Feb 11, 2011 at 11:30 AM, Rodrigo Alves Vieira <[email protected]> 
> wrote:
> Hello everyone, in my Rails app I need to validate a string that on creation 
> can not have its first chars empty or composed by any special chars.
> 
> For example: " file" and "%file" aren't valid. Do you know what Regex I 
> should use?
> 
> You could utilize the "anchor" for this -- that is you say that the line must 
> "begin" with the characters that match the following regex.
> Something like: /\A[\w]+$/ would work.

Note that \w will match an underscore.  Don't know if you consider that 
"special" or not...

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