How can I match all images without thumb image using regexp

Question

How can I match all images without thumb image using regexp ?

hi.gif
thumb.gif
hello.gif

Result should be :

hi.gif
hello.gif

I am using .+(gif|GIF|jpg|JPG) to match all images

score 2 · Accepted Answer · answered Dec 02 '10 at 10:06

2

You can use -ve lookahead assertion as:

^(?!thumb).+\.(?:gif|GIF|jpg|JPG)$

answered Dec 02 '10 at 10:06

codaddict

@faressoft, since you are testing multiple inputs, you need to enable multi-line mode. See the link in my post. – codaddict Dec 02 '10 at 10:10
It is very good. but how can I match only ".gif" when image != thumb.gif – faressoft Dec 02 '10 at 10:11
If the image is not `thumb`, you want to capture only the `.` and the extension? If yes, just change the non-capturing parenthesis `(?: )` to `( )` – codaddict Dec 02 '10 at 10:15
Yes. If you want to capture the `.` aswell, put that in the grouping: http://www.rubular.com/r/CUtsdxSwCh – codaddict Dec 02 '10 at 10:26
I want match .gif for the first image and third image without its name – faressoft Dec 02 '10 at 10:28
result shoud be .gif and .gif not hi.gif and hello.gif – faressoft Dec 02 '10 at 10:29
Check the `Match captures:` section. – codaddict Dec 02 '10 at 10:35

score 0 · Answer 2 · answered Dec 02 '10 at 10:05

0

Put a negative look-ahead at the start:

(?!thumb\.).+(gif|GIF|jpg|JPG)

answered Dec 02 '10 at 10:05

Guffa

score -1 · Answer 3 · answered Dec 02 '10 at 10:16

-1

You can use this regex:

.+(?<!^thumb)\..+$

Also add options Multiline.

answered Dec 02 '10 at 10:16

arena-ru

3 Answers3