[R] subbing a string vector for another string vector

[jlemaitre]

I have a data frame with two columns:
      image                               pattern
1    http://$IMAGE_ID$            www.url.com/image.jpg
2    $IMAGE_ID$                      http://www.blah.com/image.gif
...

I want to replace "$IMAGE_ID$" with the corresponding entry in the pattern
column such that the result would appear as follows:

url
http://www.url.com/image.jpg
http://www.blah.com/image.gif

Using something like  > gsub("\\$IMAGE\\_ID\\$",image,pattern) doesn't work
because it only takes uses the first entry in "pattern" as the replacement
for all "image" entries:

url
http://www.url.com/image.jpg
www.url.com/image.jpg

Please help.
Thanks.




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