From: Brian Candler <b.candler@...>
Date: 2009-01-26T00:29:23+09:00
Subject: Re: regural expression with not condition.

Vamsi Krishna wrote:
>  i'm trying validate the format which doesn't consist of an empty string
> in the single or double quotes.
> 
> validates_format_of :name,:with=>/^['"][ ]*['"]$/ ,:on=> :create
> 
> /^['"][ ]*['"]$/ it does validation for like the string ' ' and " " . i
> need except this like the string may contain "vamsi"  or 'vamsi' or
> "vamsi's" all these three are valid for me.

What do you mean: the string may contain spaces, but must not start or 
end with one?

> so how to modify the above expression is there any thing like
>  :without? (ofcourse there is no)

Yes there is:
  validates_each :name do |record,attr,value|
    record.errors.add attr, 'is invalid' if value[0] =~ /some_regexp/
  end
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