Gsub HELP

ruby-talk
1

Hi all
   I am not Expert at Rails or Ruby
   I have a string ..it contains text and images also..
   from that string i want to replace the images into empty space..that
is images Has to Be Removed.
   I tried to solve By using string.gsub..But doesn't Work
   I tried like below

   item.description = item.description.gsub("img src ",'')
   So any guru can give Me solution...

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2

Newb Newb wrote:

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Hi all
   I am not Expert at Rails or Ruby
   I have a string ..it contains text and images also..
   from that string i want to replace the All The Images Into
   >space..that is images Has to Be Removed.
   
   I tried like below

   item.description = item.description.gsub(/\<*img.*src=".*".*?\/\>/,' ')

    Using This Regular Expression I can able to Reomve Only The First
   Occurrences of The Images,But I Need TO Remove All Occurences Of The Images

   So Any Guru Can give Me solution...

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3

The . stays for any character, as such your regular expression seems
to be way too greedy.
This however should not harm too much if there is only one img tag in
one line, although backtracking
might be a performance issue. I do however fail to understand the
behavior you described.
Anyway, I believe the following regex should do fine:

item.description.gsub! /<img.*?>/, ""

HTH
Robert

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On Sat, Aug 23, 2008 at 9:06 AM, Newb Newb <hema@angleritech.com> wrote:

Newb Newb wrote:

Hi all
   I am not Expert at Rails or Ruby
   I have a string ..it contains text and images also..
   from that string i want to replace the All The Images Into
   >space..that is images Has to Be Removed.

   I tried like below

   item.description = item.description.gsub(/\<*img.*src=".*".*?\/\>/,' ')

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There's no one thing that's true. It's all true.
--
Ernest Hemingway

4

   item.description = item.description.gsub(/\<*img.*src=".*".*?\/\>/,' ')

    Using This Regular Expression I can able to Reomve Only The First
   Occurrences of The Images,But I Need TO Remove All Occurences Of The Images

How did you do with the >10 replies you got before? Did Hpricot work out?

5

The . stays for any character, as such your regular expression seems
to be way too greedy.
This however should not harm too much if there is only one img tag in
one line, although backtracking
might be a performance issue. I do however fail to understand the
behavior you described.
Anyway, I believe the following regex should do fine:

item.description.gsub! /<img.*?>/, ""

HTH
Robert

--
http://ruby-smalltalk.blogspot.com/

There's no one thing that's true. It's all true.

thanks a lot
it works

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