Rails - Jun 2007 - Regexp not matched

Sorry, meant to post this in the rails forum. Anyways, how would I write
a rescue method to recover from a failed regexp parsing with error
"regexp not matched"

-Thanks

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sorry, got it

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th8254 wrote:
> Sorry, meant to post this in the rails forum. Anyways, how would I write
> a rescue method to recover from a failed regexp parsing with error
> "regexp not matched"
Could you post some code? If your user puts a regexp into a string r (and if 
you trust that user not to taint your program''s interior), you just
need
this:

  if /#{ r }/ =~ sample rescue advise_user(r) && false

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  Phlip
  http://www.oreilly.com/catalog/9780596510657/
  "Test Driven Ajax (on Rails)"
  assert_xpath, assert_javascript, & assert_ajax 


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Hi --

On Sun, 1 Jul 2007, Phlip wrote:
>
> th8254 wrote:
>
>> Sorry, meant to post this in the rails forum. Anyways, how would I
write
>> a rescue method to recover from a failed regexp parsing with error
>> "regexp not matched"
>
> Could you post some code? If your user puts a regexp into a string r (and
if
> you trust that user not to taint your program''s interior), you
just need
> this:
>
>  if /#{ r }/ =~ sample rescue advise_user(r) && false
I don''t think (though if I''m wrong of course I''d like
to find out)
that r can do any damage there.  The evaluation of r is itself already
a string, so this:

   r = "gets"
   /#{r}/

does not do the same as:

   /#{gets}/

The bigger issue here, though, is specifically rescuing from a regex
parsing error, which doesn''t seem to fall under the jurisdiction of
the usual runtime rescuing mechanism:

   irb(main):029:0> if /[/; end rescue "Bad regex"
   (irb):29: warning: regex literal in condition
   SyntaxError: compile error
   (irb):29: invalid regular expression; ''['' can''t be
the last character
   ie. can''t start range at the end of pattern: /[/


David

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dblack wrote:
> The bigger issue here, though, is specifically rescuing from a regex
> parsing error, which doesn''t seem to fall under the jurisdiction
of
> the usual runtime rescuing mechanism:
rx = eval(''/'' + r + ''/'') rescue whatever($!)

-- 
  Phlip
  http://www.oreilly.com/catalog/9780596510657/
  "Test Driven Ajax (on Rails)"
  assert_xpath, assert_javascript, & assert_ajax 

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Hi --

On Sun, 1 Jul 2007, Phlip wrote:
>
> dblack wrote:
>
>> The bigger issue here, though, is specifically rescuing from a regex
>> parsing error, which doesn''t seem to fall under the
jurisdiction of
>> the usual runtime rescuing mechanism:
>
> rx = eval(''/'' + r + ''/'') rescue
whatever($!)
Also you can do:

   Regexp.new(r) rescue...


David

-- 
* Books:
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   RUBY FOR RAILS (http://www.manning.com/black)
* Ruby/Rails training
     & consulting:  Ruby Power and Light, LLC (http://www.rubypal.com)

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