From: Siep Korteling <s.korteling@...>
Date: 2009-01-07T10:17:35+09:00
Subject: Re: Simple Regexp help

Tim Greer wrote:
> Joe Blow wrote:
> 
>> How can I test a word to make sure it ONLY contains certain
>> characters?
>> 
>> Say i have an expression like /[A-Z]/i
>> 
>> How could i have "Testing" pass but "Testing123" fail?
>> 
>> PS. I can not dynamically create the expression so it looks like this
>> /[A-Z{10}]/
> 
> If you only want a-z, set the character class to start and end the
> string, otherwise it'll match anything with a character that's in the
> alphabet, regardless of what follows it.  (...)

You can also test for the opposite, anything not in the range a-z.

class String
  def all_letters?
   (self =~  /[^a-z]/i).nil?
  end
end

puts "Testing".all_letters?
# => true
puts "Tes34ting".all_letters?
# => false

hth,

Siep
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