From: "Peña, Botp" <botp@...>
Date: 2008-04-18T13:24:38+09:00
Subject: Re: Reg Exp

[mailto:list-bounce@example.com] On Behalf Of Dipesh Batheja
# map.connect ':lang/:canonic/:controller/:action/:id
# it matches paths like:
# http://www.abc.com/en/acme/products/show/1
# where :canonic is "acme" in this example
# I have a specific case where :canonic cannot be "admin"
# map.connect method take a key :requirements where I can 
# specify a regex:
# map.connect ':lang/:canonic/:controller/:action/:id, :requirement => 
# {:canonic => /regex/ }
# I need to write in the reg ex, in such a way, so that when something 
# like:
# http://www.abc.com/en/admin/products/show/1
# comes, it doesn't match the path.

try the ?!, this seems to negate the regex
eg, the following will strictly not allow admin and case-combi like Admin. it will thus allow xadmin, radmin, administration, etc..

irb(main):044:0> /(?!^admin$).{5,5}/i =~ "admin"
=> nil
irb(main):045:0> /(?!^admin$).{5,5}/i =~ "Admin"
=> nil
irb(main):046:0> /(?!^admin$).{5,5}/i =~ "ADMIN"
=> nil
irb(main):047:0> /(?!^admin$).{5,5}/i =~ "administration"
=> 0
irb(main):048:0> /(?!^admin$).{5,5}/i =~ "xadmin"
=> 0
irb(main):049:0> /(?!^admin$).{5,5}/i =~ "xadminx"
=> 0
irb(main):050:0> /(?!^admin$).{5,5}/i =~ "adminx"

kind regards -botp