Regexp: match and exclude

Question

In this list:

• image_1.png
• image_1_small.png
• image_2.png
• image_2_small.png
• image_three.png
• image_three_small.png
• antoher_image.png

I would like to match only those images that BEGIN with the word image BUT do not contain the word small.

The regex should then return:

• image_1.png
• image_2.png
• image_three.png

So far I have:

/^image(?!.*small)/m

Answer 1

I tested this with your single lines from the list

 ^image(?!.*_small.*).*\.png$

see also this discussion on how to exclude keywords in regex