How can I match all images without thumb image using regexp

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

hi.gif开发者_C百科
thumb.gif
hello.gif

Result should be :

hi.gif
hello.gif

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

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You can use -ve lookahead assertion as:

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

Rubular link

Regexr link

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Put a negative look-ahead at the start:

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

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You can use this regex:

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

Also add options Multiline.